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mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197
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gestational age<obstetrics> Foetal age of a newborn, calculated from the number of completed weeks since the first day of the mother's last menstrual period to the date of birth. ... (27 Sep 1997) ...
gestational diabetesA glucose intolerance which occurs in pregnancy, usually noticed between the 24th and 28th weeks of pregnancy. In most cases the blood glucose level returns to normal after delivery. Although the symptoms of this form of diabetes are mild and nonserious for the mother, elevated blood glucose in the mother has been associated with an increased risk …
gestational oedemaOccurrence of a generalised and excessive accumulation of fluid in the tissues of greater than 1+ pitting after 12 hours' bed rest, or of a weight gain of 5 pounds or more in 1 week due to the influence of pregnancy. ... (05 Mar 2000) ...
gestational proteinuriaThe presence of proteinuria during or under the influence of pregnancy in the absence of hypertension, oedema, renal infection, or known intrinsic renovascular disease. ... (05 Mar 2000) ...
gestational psychosisAn obsolete term for psychotic reaction with morbid depressive features associated with pregnancy. ... See: postpartum psychosis, puerperal psychosis. ... (05 Mar 2000) ...
gestational sac<radiology> Arises from blastocyst which implants into secretory endometrium surrounded by echogenic trophoblast sac size: 6th week = 17mm;, 8th week = 31 mm, fills chorionic cavity by 12th week visualization of gestational sac, relative to beta-hCG levels: transabdominal scan: greater than 1800 IU/l, transvaginal scan: less than 500 IU/l = 2 …
gestational trophoblastic disease(choriocarcinoma, molar pregnancy) a type of cancer associated with pregnancy in which a grape-like mole develops in the womb instead of a foetus. ... (16 Dec 1997) ...
gestinSynonym for gestagen ... Inclusive term used to denote any one of several gestagenic substances, which are usually steroid hormones. ... Synonym: gestin, progestin. ... (05 Mar 2000) ...
gestonorone caproate<chemical> A long-acting potent progestogen structurally related to progesterone. ... Pharmacological action: progestational hormones, synthetic. ... Chemical name: 19-Norpregn-4-ene-3,20-dione, 17-((1-oxohexyl)oxy)- ... (12 Dec 1998) ...
gestosisAny disorder of pregnancy. ... Origin: L. Gesto, to carry, to bear, + G. -osis, condition ... (05 Mar 2000) ...
gestosis, ephHypertensive state associated with oedema and proteinuria which develops during pregnancy up to the 20th week of gestation, after which it is classified as preeclampsia. ... (12 Dec 1998) ...
gestrinone<chemical> A non-oestrogenic contraceptive which is a weak progestin with strong anti-progesterone properties. It is effective if used once a week orally or can also be used in intravaginal devices. ... Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. ... Chemical name: 18,19-Dinorpregna-4,9,11-trien- …
gesture1. Any movement expressive of an idea, opinion, or emotion. ... 2. An act. ... Origin: L. Gestus, movement, gesture ... Suicide gesture, an apparent attempt at suicide by someone wishing to attract attention, gain sympathy, or achieve some goal other than self-destruction. ... (05 Mar 2000) ...
gesturesMovement of a part of the body for the purpose of communication. ... (12 Dec 1998) ...
get1. To make acquisition; to gain; to profit; to receive accessions; to be increased. 'We mourn, France smiles; we lose, they daily get.' (Shak) ... 2. To arrive at, or bring one's self into, a state, condition, or position; to come to be; to become; with a following adjective or past participle belonging to the subject of the verb; as, to get sober; …
GeyGeorge O., U.S. Physician and researcher, *1899. ... See: Gey's solution. ... (05 Mar 2000) ...
Gey's solutionA salt solution usually used in combination with naturally occurring body substances (e.g., blood serum, tissue extracts) and/or more complex chemically defined nutritive solution's for culturing animal cells. ... (05 Mar 2000) ...
GFAPSynonym for glial fibrillary acidic protein ... <protein> This protein, found in microfilaments of glial cells, helps distinguish glial from nonglial tumours. A laboratory stain is used to test for its presence. ... (16 Dec 1997) ...
GFRSynonym for glomerular filtration rate ... <nephrology> Measure of the kidneys' ability to filter and remove waste products. ... (09 Oct 1997) ...
GGTSynonym for gamma-glutamyl transpeptidase ... gamma-glutamyltransferase ...
GHSynonym for growth hormone ... <endocrinology, hormone> Polypeptide (191 amino acids) produced by anterior pituitary that stimulates liver to produce somatomedins 1 & 2. ... (13 Nov 1997) ...
ghanaA republic in western africa, south of burkina faso and west of togo. Its capital is accra. It was called the gold coast until 1957, from the gold discovered there by the portuguese in the late 15th century. A centre for slave trade, it was acquired by the british in the 19th century and became independent in 1957. Ghana took its name from a tribal …
ghatti gumSynonym for Indian gum ... An exudation from Anogeisus latifolia (family Combrettaceae); the mucilage is used as a substitute for acacia mucilage. ... Synonym: ghatti gum. ... (05 Mar 2000) ...
gheeA clarified butter in India made from cow or buffalo milk that has been coagulated before churning; used as an emollient, a dressing for wounds, and a food. ... Origin: Eng. Spelling of Hind. Ghi ... (05 Mar 2000) ...
Gheel colonyA colony in Gheel, Belgium, originating in the 13th century, for the informal communal care, in private homes, of severely mentally disordered persons. ... (05 Mar 2000) ...
ghetto1. The Jews' quarter in an Italian town or city. 'I went to the Ghetto, where the Jews dwell.' (Evelyn) ... 2. By extension, any section of a town inhabited predominantly by members of a specific ethnic, national or racial group, such segregation usually arising from social or economic pressure. ... 3. (fig) any isolated group of people. ... 4. (fig) …
Ghon-Sachs bacillusSynonym for Clostridium septicum ... A species found in malignant oedema of animals, in human war wounds, and in cases of appendicitis; it is pathogenic for guinea pigs, rabbits, mice, and pigeons and produces an exotoxin that is lethal and haemolytic. ... Synonym: Ghon-Sachs bacillus, Sachs' bacillus, vibrion septique. ... (05 Mar 2000) ...
Ghon, Anton<person> Czechoslovakian pathologist, 1866-1936. ... See: Ghon's complex, Ghon's focus, Ghon's primary lesion, Ghon's tubercle, Ghon-Sachs bacillus. ... (05 Mar 2000) ...
Ghon's complexSynonym for Ghon's tubercle ... Calcification seen in pulmonary parenchyma (usually mid-lung area) and hilar nodes resulting from earlier, usually childhood, infection with tuberculosis. ... Synonym: Ghon's complex, Ghon's focus, Ghon's primary lesion. ... (05 Mar 2000) ...
Ghon's focusSynonym for Ghon's tubercle ... Calcification seen in pulmonary parenchyma (usually mid-lung area) and hilar nodes resulting from earlier, usually childhood, infection with tuberculosis. ... Synonym: Ghon's complex, Ghon's focus, Ghon's primary lesion. ... (05 Mar 2000) ...
Ghon's primary lesionSynonym for Ghon's tubercle ... Calcification seen in pulmonary parenchyma (usually mid-lung area) and hilar nodes resulting from earlier, usually childhood, infection with tuberculosis. ... Synonym: Ghon's complex, Ghon's focus, Ghon's primary lesion. ... (05 Mar 2000) ...
Ghon's tubercleCalcification seen in pulmonary parenchyma (usually mid-lung area) and hilar nodes resulting from earlier, usually childhood, infection with tuberculosis. ... Synonym: Ghon's complex, Ghon's focus, Ghon's primary lesion. ... (05 Mar 2000) ...
ghost1. The spirit; the soul of man. 'Then gives her grieved ghost thus to lament.' (Spenser) ... 2. The disembodied soul; the soul or spirit of a deceased person; a spirit appearing after death; an apparition; a specter. 'The mighty ghosts of our great Harrys rose.' (Shak) 'I thought that I had died in sleep, And was a blessed ghost.' (Coleridge) ... 3. …
ghost cell<haematology> A red blood cell which has had all of its cytoplasmic contents removed by cell lysis so that only its outer cytoplasmic membrane remains. ... (17 Dec 1997) ...
ghost cell glaucomaGlaucoma occurring after vitrectomy, arising from erythrocyte membranes blocking outflow channels of aqueous humor. ... (05 Mar 2000) ...
ghost corpuscleSynonym for achromocyte ... A hypochromic, crescent-shaped erythrocyte, probably resulting from artifactual rupture of a red cell with loss of haemoglobin. ... Synonym: achromacyte, achromatocyte, ghost corpuscle, phantom corpuscle, Ponfick's shadow, shadow corpuscle, shadow, Traube's corpuscle. ... Origin: G. A-priv. + chroma, colour, + kytos, hollow …
ghost toothA tooth with reduced radiodensity seen in regional odontodysplasia. ... (05 Mar 2000) ...
ghostsSynonym for erythrocyte ghost ... <cell biology> The membrane and cytoskeletal elements of the erythrocyte devoid of cytoplasmic contents, but preserving the original morphology. ... (18 Nov 1997) ...
ghoul handA condition seen in African blacks, probably a manifestation of tertiary yaws, marked by depigmentation of the palms and contraction of the skin which give a clawlike and corpselike appearance to the hand's. ... (05 Mar 2000) ...
GHRFSynonym for growth hormone-releasing factor ... growth hormone-releasing hormone ...
GHRHSynonym for growth hormone-releasing hormone ... <endocrinology> Peptide hormone related to the glucagon family, released from the pituitary, acts on the adenohypophysis to release growth hormone. ... Synonym: somatoliberin, growth hormone-releasing factor. ... (20 Sep 2002) ...
GHz<abbreviation> Gigahertz, equal to one billion (109) hertz; used in ultrasound. ... (05 Mar 2000) ...
GISynonym for gastrointestinal ... <anatomy> Pertaining to or communicating with the stomach and intestine, as a gastrointestinal fistula. ... (18 Nov 1997) ...
GI bleedingThis describes any bleeding that may occur along the coarse of the gastrointestinal tract. This includes bleeding from the oesophagus, stomach, duodenum, small intestine, large intestine, rectum or anus. ... (27 Sep 1997) ...
GI endoscopy<procedure> A diagnostic procedure which involves the introduction of a flexible fibreoptic scope into the lower or upper gastrointestinal tract for diagnostic or therapeutic purposes. ... (27 Sep 1997) ...
GI-tract secretions<radiology> Organ Volume (ml/day) ----- --------------- Salivary glands 1500 Stomach 2500 Biliary system 500 Pancreas 1500 Intestine 1000 ... (12 Dec 1998) ...
GI-tract target lesion<radiology> Metastatic melanoma, primary neoplasm, spindle cell tumour (benign or malignant), lymphoma, carcinoid, carcinoma, metastasis, breast carcinoma, lung carcinoma, renal carcinoma, Kaposi's sarcoma, eosinophilic granuloma, ectopic pancreas ... (12 Dec 1998) ...
GiacominiCarlo, Italian anatomist, 1841-1898. ... See: band of Giacomini, frenulum of Giacomini, uncus band of Giacomini. ... (05 Mar 2000) ...
GiannuzziItalian anatomist, 1839-1876. ... See: Giannuzzi's crescents, Giannuzzi's demilunes. ... (05 Mar 2000) ...
Giannuzzi's crescentsSynonym for serous demilunes ... The serous cells at the distal end of a mucous, tubuloalveolar secretory unit of certain salivary glands. ... Synonym: Giannuzzi's crescents, Giannuzzi's demilunes, Heidenhain's crescents, Heidenhain's demilunes. ... (05 Mar 2000) ...
Giannuzzi's demilunesSynonym for serous demilunes ... The serous cells at the distal end of a mucous, tubuloalveolar secretory unit of certain salivary glands. ... Synonym: Giannuzzi's crescents, Giannuzzi's demilunes, Heidenhain's crescents, Heidenhain's demilunes. ... (05 Mar 2000) ...
GianottiF., 20th century Italian dermatologist. ... See: Gianotti-Crosti syndrome. ... (05 Mar 2000) ...
Gianotti-Crosti syndrome<syndrome> A cutaneous manifestation of hepatitis B infection occurring in young children; an exanthem comprised of dusky papules on the legs, buttocks, and extensors of the arms; it lasts 2 to 8 weeks and is associated with adenopathy and malaise. ... Synonym: papular acrodermatitis of childhood. ... (05 Mar 2000) ...
giant1. A man of extraordinari bulk and stature. 'Giants of mighty bone and bold emprise.' ... 2. A person of extraordinary strength or powers, bodily or intellectual. ... 3. Any animal, plant, or thing, of extraordinary size or power. Giant's Causeway, a vast collection of basaltic pillars, in the county of Antrim on the northern coast of Ireland. ... Ori …
giant axon<biology> Extraordinarily large unmyelinated axons found in invertebrates. ... Some, like the squid giant axon, can approach 1 mm diameter. Large axons have high conduction speeds, the giant axons are invariably involved in panic or escape responses and may (e.g. Crayfish) have electrical synapses to further increase speed. ... Vertebrate axons …
giant axonal neuropathy<paediatrics> A rare disorder beginning at or after the third year of life, and presenting clinically with kinky hair, progressive painless clumsiness, muscle weakness and atrophy, sensory loss, and areflexia. Pathologically, both myelinated and unmyelinated nerve fibres contain axonal spheroids packed with neurofilaments; sporadic in nature. …
giant cell<pathology> A cell of large size, often with many nuclei. They are multinucleated masses produced by the fusion of many cells. ... They are often associated with viral infections. In AIDS, they are induced when the envelope glycoprotein of HIV binds to the CD4 antigen of uninfected neighboring T4 cells. The resulting syncytium leads to cell de …
giant cell aortitis<pathology> Giant cell arteritis involving the aorta. ... (05 Mar 2000) ...
giant cell arteritis<pathology> An inflammatory condition of the temporal artery. It is a serious chronic vascular disease, characterised by inflammation of the walls of the blood vessels (vasculitis). ... The age of affected patients is usually over 50 years of age. It most often involves the carotid artery system, and can lead to blindness or stroke. ... It can …
giant cell astrocytoma<radiology> Malignant transformation from hamartoma (tuber) of tuberous sclerosis, enhances (unlike benign lesions), arises only about foramen of Monro, not really an astrocytoma, it's a giant-cell tumour ... (12 Dec 1998) ...
giant cell carcinoma<tumour> A malignant epithelial neoplasm characterised by unusually large anaplastic cells. ... (05 Mar 2000) ...
giant cell epulisSynonym for giant cell granuloma ... <dermatology, oncology> A non-neoplastic lesion characterised by a proliferation of granulation tissue containing numerous multinucleated giant cells. ... It occurs on the gingiva and alveolar mucosa (occasionally on other soft tissues) where it presents as a soft red-blue haemorrhagic nodular swelling. It a …
giant cell fibroma<tumour> A tumour of the oral mucosa composed of fibrous connective tissue with large stellate and multinucleate fibroblasts; shares a similar histology with the retrocuspid papilla, fibrous papule of the nose, pearly penile papule, and the ungual fibroma. ... (05 Mar 2000) ...
giant cell granuloma<dermatology, oncology> A non-neoplastic lesion characterised by a proliferation of granulation tissue containing numerous multinucleated giant cells. ... It occurs on the gingiva and alveolar mucosa (occasionally on other soft tissues) where it presents as a soft red-blue haemorrhagic nodular swelling. It also occurs within the mandible or ma …
giant cell hepatitisSynonym for neonatal hepatitis ... Hepatitis in the neonatal period presumed to be due to a variety of causes, chiefly viral; characterised by direct and indirect bilirubinaemia, hepatocellular degeneration, and appearance of multinucleated giant cells; may be difficult to distinguish from biliary atresia, but is more likely to end with recovery, al …
giant cell hyaline angiopathy<pathology> An inflammatory infiltrate containing foreign body giant cells and eosinophilic material. Fragments of foreign material resembling vegetable matter may be included. ... Synonym: pulse granuloma. ... (05 Mar 2000) ...
giant cell myelomaSynonym for giant cell tumour of bone ... A bone tumour composed of cellular spindle-cell stroma containing scattered multinucleated giant cells resembling osteoclasts. The tumours range from benign to frankly malignant lesions. The tumour occurs most frequently in an end of a long tubular bone in young adults. ... (12 Dec 1998) ...
giant cell pneumoniaA rare complication of measles, with the postmortem finding of multinucleated giant cells lining alveoli. ... Synonym: Hecht's pneumonia, interstitial giant cell pneumonia. ... (05 Mar 2000) ...
giant cell sarcoma<tumour> A malignant giant cell tumour of bone. ... (05 Mar 2000) ...
giant cell thyroiditisSynonym for subacute granulomatous thyroiditis ... Thyroiditis with round cell (usually lymphocytes) infiltration, destruction of thyroid cells, epithelial giant cell proliferation, and evidence of regeneration; thought by some to be a reflection of a systemic infection and not an example of true chronic thyroiditis. ... Synonym: de Quervain's thyroi …
giant cell tumour<radiology> Osteoclastoma, GCT, any age, typically 20-35, site: metaphysis into epiphysis, 50% at knee (distal femur, proximal tibia), long bones, patella, spine, eccentric, expansile, with or without soap bubble appearance, treatment: curette, fill with methacrylate, 10% recur, a few are premalignant or malignant, cannot determine malignancy …
giant cell tumour of boneA bone tumour composed of cellular spindle-cell stroma containing scattered multinucleated giant cells resembling osteoclasts. The tumours range from benign to frankly malignant lesions. The tumour occurs most frequently in an end of a long tubular bone in young adults. ... (12 Dec 1998) ...
giant cell tumour of tendon sheathA nodule, possibly inflammatory in nature, arising commonly from the flexor sheath of the fingers and thumb; composed of fibrous tissue, lipid-and haemosiderin-containing macrophages, and multinucleated giant cells. ... Synonym: localised nodular tenosynovitis. ... (05 Mar 2000) ...
giant cell tumoursTumours of bone tissue or synovial or other soft tissue characterised by the presence of giant cells. The most common are giant cell tumour of tendon sheath and giant cell tumour of bone. ... (12 Dec 1998) ...
giant cells, foreign-bodyMultinucleated cells (fused macrophages), characteristic of granulomatous inflammation, which form around exogenous material in the skin. They are similar in appearance to langhans giant cells (giant cells, langhans), but foreign-body giant cells have more abundant chromatin and their nuclei are scattered in an irregular pattern in the cytoplasm.
giant cells, langhans
Multinucleated cells (fused macrophages) seen in granulomatous inflammations such as tuberculosis, syphilis, sarcoidosis, and deep fungal infections. They resemble foreign-body giant cells (giant cells, foreign body) but langhans giant cells contain less chromatin and their nuclei are arranged peripherally in a horseshoe-shaped pattern. Langhans gi …
giant chromosome
Synonym for polytene chromosome ... <cell biology> Giant chromosomes produced by the successive replication of homologous pairs of chromosomes, joined together (synapsed) without chromosome separation or nuclear division. They thus consist of many up to 1000) identical chromosomes (strictly chromatids) running parallel and in strict register. …
giant colon
Synonym for megacolon ... An abnormally large or dilated colon, the condition may be congenital or acquired, acute or chronic. ... (18 Nov 1997) ...
giant condyloma
A large type of condyloma acuminatum found in the anus, vulva, or preputial sac of the penis of middle-aged, uncircumcised men; it tends to extend deeply and recur. ... Synonym: Buschke-Lowenstein tumour. ... (05 Mar 2000) ...
giant drusen
An obsolete term for a glial hamartoma of the optic nerve head or the peripapillary retina, seen in tuberous sclerosis. ... (05 Mar 2000) ...
giant follicular lymphoblastoma
Synonym for nodular lymphoma ... <tumour> A malignant lymphoma arising from lymphoid follicular B-cells which may be small or large, growing in a nodular pattern. ... Synonym: follicular lymphoma, giant follicular lymphoblastoma. ... (05 Mar 2000) ...
giant follicular thyroiditis
A variant of Hashimoto's thyroiditis in which lymphocytic infiltrate in thyroid has formed into giant follicles. ... (05 Mar 2000) ...
giant gastric folds
Enlarged gastric submucosal ridges covered by hyperplastic mucosa, as seen in Zollinger-Ellison syndrome, Menetrier's disease, and hypertrophic hypersecretory gastropathy. ... (05 Mar 2000) ...
giant hairy nevus
<dermatology> These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. ... A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. ... (17 Dec 1997) ...
giant hives
Synonym for angioedema ... A vascular reaction involving the deep dermis or subcutaneous or submucal tissues, representing localised oedema caused by dilatation and increased permeability of the capillaries and characterised by development of giant wheals. ... (18 Nov 1997) ...
giant hypertrophy of gastric mucosa
Synonym for Menetrier's disease ... Gastric mucosal hyperplasia, either mucoid or glandular; the latter type may be associated with the Zollinger-Ellison syndrome. ... Synonym: giant hypertrophy of gastric mucosa, hypertrophic gastritis, Menetrier's syndrome. ... (05 Mar 2000) ...
giant lymph node hyperplasia
Large benign, hyperplastic lymph nodes. The more common hyaline vascular subtype is characterised by small hyaline vascular follicles and interfollicular capillary proliferations. Plasma cells are often present and represent another subtype with the plasma cells containing IgM and IgA. ... (12 Dec 1998) ...
giant melanosome
A large spherical melanosome (1 to 6 u in diameter) formed in the cytoplasm of melanocytes in cafe-au-lait spots and other melanocytic disorders. ... Synonym: macromelanosome. ... (05 Mar 2000) ...
giant osteoid osteoma
Synonym for osteoblastoma ... A benign, painful, tumour of bone characterised by the formation of osteoid tissue, primitive bone and calcified tissue. It occurs frequently in the spine of young persons. ... (12 Dec 1998) ...
giant pigmented nevus
Synonym for bathing trunk nevus ... These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. ... (27 Sep 1997) ...
giant urticaria
Synonym for angioedema ... A vascular reaction involving the deep dermis or subcutaneous or submucal tissues, representing localised oedema caused by dilatation and increased permeability of the capillaries and characterised by development of giant wheals. ... (18 Nov 1997) ...
giantism
Synonym for gigantism ... A condition where there is over-production of growth hormone by the pituitary gland in a child before the bone growth plates close, resulting in excessive long bone growth. ... (27 Sep 1997) ...
Giardia
<protozoa> Genus of flagellate protozoans which are free swimming parasites that inhabits the gastrointestinal tract of vertebrates and causes gastroenteritis in man (Giardia lamblia). ... The cells have a large disc or sucker on their anterior ventral surfaces, by which they attach to the intestinal mucosa. The attachment of the disc is very …
Giardia intestinalis
Synonym for giardia lamblia ... A species of parasitic protozoa that attaches itself to the intestinal mucosa and feeds on mucous secretions. The organism is roughly pear-shaped and motility is somewhat erratic, with a slow oscillation about the long axis. Considered for many years to be non-pathogenic and often found in completely asymptomatic indi …
giardia lamblia
A species of parasitic protozoa that attaches itself to the intestinal mucosa and feeds on mucous secretions. The organism is roughly pear-shaped and motility is somewhat erratic, with a slow oscillation about the long axis. Considered for many years to be non-pathogenic and often found in completely asymptomatic individuals, there is presently str …
giardiasis
An infection of the small intestine caused by the flagellated protozoan giardia lamblia. It is spread via contaminated food and water and by direct person-to-person contact. ... (12 Dec 1998) ...
giardiavirus
A genus of RNA protozoan viruses of the family totiviridae. It infects many isolates of the flagellated protozoan human parasite g. Lamblia, but does not seem to be associated with the virulence of the parasite. The type species is giardia lamblia virus. ... (12 Dec 1998) ...
giardin
<protein> Group of proteins, of 29-38 kD, found in the ventral discs of Giardia lamblia. ... (17 Dec 1997) ...
gib
A male cat; a tomcat. ... Origin: Abbreviated fr. Gilbert, the name of the cat in the old story of 'Reynard the Fox'. In the 'Romaunt of the Rose', etc. ... A piece or slip of metal or wood, notched or otherwise, in a machine or structure, to hold other parts in place or bind them together, or to afford a bearing surface; usually held or adjusted by …
Gibb's phase rule
Synonym for phase rule ... An expression of the relationships existing between systems in equilibrium: P + V = C + 2, where P is the number of phases, V the variance or degrees of freedom, and C the number of components; it also follows that the variance is, V = C + 2 -P. For H2O at its triple point, V = 1 + 2 -3 = 0, i.e., both temperature and pres …
