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 mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


triplegia
Paralysis of an upper and a lower extremity and of the face, or of both extremities on one side and of one on the other. ... Origin: tri-+ G. Plege, stroke ... (05 Mar 2000) ...

triplet
<microscopy> A combination of three simple lenses cemented together. Two positive lenses with a negative lens between them can produce a well-corrected system. ... (05 Aug 1998) ...

triplet state
A second excited state of a molecule (e.g., chlorophyll) produced by absorption of light to produce the singlet state, then loss of some energy (fluorescence) to arrive at the longer-lived triplet state The molecule may remain sufficiently long in the triplet state for a second activating light quantum to be effective in producing a 'second triplet …

triplicate
Folded three times. ... (09 Oct 1997) ...

triploblastic
<embryology> Describes an animal which, as an embryo, had three distinct embryonic tissue layers - the ectoderm, mesoderm, and endoderm. ... This is in contrast to animals which are diploblastic (has two distinct tissue layers) and those which do not have any distinct tissue layers as an embryo (nor organs and distinct tissues as an adult). …

triploid
<genetics, molecular biology> Having three times the haploid number of chromosomes. ... (18 Nov 1997) ...

triploidy
The presence of three haploid sets of chromosomes, instead of two, in all cells; results in foetal or neonatal death. ... (05 Mar 2000) ...

triplopia
Visual defect in which three images of the same object are seen. ... Synonym: triple vision. ... Origin: G. Triploos, triple, + opsis, sight ... (05 Mar 2000) ...

tripod
1. Any utensil or vessel, as a stool, table, altar, caldron, etc, supported on three feet. ... On such, a stool, in the temple of Apollo at Delphi, the Pythian priestess sat while giving responses to those consulting the Delphic oracle. ... 2. A three-legged frame or stand, usually jointed at top, for supporting a theodolite, compass, telescope, came …

tripod fracture
<radiology> Malar fracture, trimalar fracture, inferior orbital rim, lateral orbital wall, fracture/dislocation of zygomatic arch ... (12 Dec 1998) ...

tripodia
Condition seen in conjoined twins when fusion has merged the lower extremities on the joined sides to form a single foot, so that there are only three feet for the two bodies. ... See: conjoined twins. ... Origin: tri-+ G. Pous, foot ... (05 Mar 2000) ...

tripos
1. <equipment> A tripod. ... 2. A university examination of questionists, for honors; also, a tripos paper; one who prepares a tripos paper. ... Classical tripos examination, the final university examination for classical honors, optional to all who have taken the mathematical honors. Tripos paper, a printed list of the successful candidates fo …

tripper
1. One who trips or supplants; also, one who walks or trips nimbly; a dancer. ... 2. An excursionist. ... (27 Oct 1998) ...

triprolidine
<chemical> Histamine h1 antagonist used in allergic rhinitis, asthma, and urticaria. It may cause drowsiness. ... Pharmacological action: anti-allergic agents, histamine h1 antagonists. ... Chemical name: Pyridine, 2-(1-(4-methylphenyl)-3-(1-pyrrolidinyl)-1-propenyl)-, (E)- ... (12 Dec 1998) ...

triprolidine hydrochloride
Trans-2-[3-(1-Pyrrolidinyl)-1-(p-tolyl)propenyl]pyridine hydrochloride;an antihistaminic used in the management of allergic and pruritic conditions. ... (05 Mar 2000) ...

triprosopus
Foetus with three heads fused, leaving only parts of three faces. ... Origin: tri-+ G. Prosopon, face ... (05 Mar 2000) ...

triptorelin
<chemical> 6-d-tryptophanluteinizing hormone-releasing factor (pig). A long-acting gonadorelin analog agonist. It has been used in the treatment of prostatic cancer, ovarian cancer, precocious puberty, endometriosis, and to induce ovulation for in vitro fertilization. ... Pharmacological action: antineoplastic agent, hormonal, luteolytic agent …

triquetral bone
A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. ... Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. ... (05 Mar 2000) ...

triquetral fracture
<orthopaedics> Fracture of the triquetrum or triangular bone, one of the carpal bones in the wrist. ... (27 Sep 1997) ...

triquetrous
<biology> Triangular in cross-section and acutely-angled, with three distinct longitudinal ridges. ... Compare: trigonous. ... (09 Oct 1997) ...

triquetrous cartilage
Synonym for articular disc of distal radioulnar joint ... The disk that holds together the distal ends of the radius and ulna; it is attached by its apex to a depression between the styloid process and distal surface of the head of the ulna, and by its base to the ridge separating the ulnar notch from the carpal surface of the radius. ... Synonym: di …

triradial
Triradiate ... Radiating in three directions. ... (05 Mar 2000) ...

triradius
In dermatoglyphics, the figure at the base of each finger in the palm, produced by rows of papillae running in three directions so as to form a triangle. ... Synonym: Galton's delta. ... (05 Mar 2000) ...

Tris
<abbreviation, chemical> Tris(hydroxymethyl)aminomethane and tris(hydroxymethyl)methylamine; used as a trivial name. ... (05 Mar 2000) ...

tris-
<prefix> A chemical prefix indicating three of the substituents that follow, independently linked. ... Compare: tri-. ... (05 Mar 2000) ...

tris(hydroxymethyl)aminomethane
Synonym for tromethamine ... <chemical> An organic amine proton acceptor. It is used in the synthesis of surface-active agent and pharmaceuticals; as an emulsifying agent for cosmetic creams and lotions, mineral oil and paraffin wax emulsions, is a biological buffer, and is used as an alkaliser. ... Pharmacological action: buffers, excipient.
tris(hydroxymethyl)methylamine
Synonym for tromethamine ... <chemical> An organic amine proton acceptor. It is used in the synthesis of surface-active agent and pharmaceuticals; as an emulsifying agent for cosmetic creams and lotions, mineral oil and paraffin wax emulsions, is a biological buffer, and is used as an alkaliser. ... Pharmacological action: buffers, excipient.
trisaccharide
A carbohydrate containing three monosaccharide residues, e.g., raffinose. ... (05 Mar 2000) ...

trisaccharides
Any of a class of carbohydrates composed of three glycosidically linked monosaccharide groups. ... (12 Dec 1998) ...

triskaidekaphobia
<psychology> Superstitious dread of the number thirteen. ... Origin: G. Triskaideka, thirteen, + phobos, fear ... (05 Mar 2000) ...

triskelion
<protein> A three legged structure assumed by clathrin isolated from coated vesicles. A trimer of clathrin (180 kD) with three light chains is probably the physiological sub unit of clathrin coats in coated vesicles. ... (18 Nov 1997) ...

trismic
Relating to or marked by trismus. ... (05 Mar 2000) ...

trismoid
1. Resembling trismus. ... 2. Trismus nascentium, formerly regarded as a distinct variety due to pressure on the occiput during birth. ... Origin: trismus + G. Eidos, resemblance ... (05 Mar 2000) ...

trismus
<neurology> Motor disturbance of the trigeminal nerve, especially spasm of the masticatory muscles, with difficulty in opening the mouth, a characteristic early symptom of tetanus. ... Synonym: lockjaw. ... Origin: Gr. Trismos = grating, grinding ... (18 Nov 1997) ...

trismus dolorificus
Synonym for trigeminal neuralgia ... <neurology> A disorder of trigeminal nerve (cranial nerve V) dysfunction. ... Synonym: tic douloureux. ... Characterised by excruciating paroxysms of pain in the lips, gums, cheek or chin, and, very rarely, in the distribution of the eye (ophthalmic division of the trigeminal nerve). ... (27 Sep 1997) ...

trismus nascentium
Stiffness of the jaw muscles in neonates, usually as the beginning of tetanus neonatorum. ... Synonym: trismus neonatorum. ... (05 Mar 2000) ...

trismus neonatorum
Synonym for trismus nascentium ... Stiffness of the jaw muscles in neonates, usually as the beginning of tetanus neonatorum. ... Synonym: trismus neonatorum. ... (05 Mar 2000) ...

trismus sardonicus
Synonym for risus caninus ... The semblance of a grin caused by facial spasm especially in tetanus. ... Synonym: canine spasm, cynic spasm, risus sardonicus, sardonic grin, spasmus caninus, trismus sardonicus. ... Origin: L. Risus, laugh + caninus, doglike ... (05 Mar 2000) ...

trisoctahedron
<chemistry> A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron. Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron. Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles trian …

trisomic
Relating to trisomy. ... (05 Mar 2000) ...

trisomy
<genetics, molecular biology> Term which indicates the presence of an additional whole chromosome. Each cell usually has 46 but in trisomy this is increased to 47. ... (13 Nov 1997) ...

trisomy 13 syndrome
<syndrome> A condition with three rather than the normal two chromosomes 13. Children born with this syndrome have multiple malformations and mental retardation due to the extra chromosome 13. The congenital malformations (birth defects) commonly include scalp defects, haemangiomas (blood vessel malformations) of the face and nape of the neck …

trisomy 18 syndrome
<syndrome> There are three instead of the normal two chromosomes 18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome 18. The children characteristically have low birth weight, small head (microcephaly), small jaw (micrognathia), malformations of the heart and kidneys, clenched fists …

trisomy 20 syndrome
<syndrome> Profound mental retardation with coarse facies, macrostomia and macroglossia, minor anomalies of the ears, pigmentary dysplasia of the skin, dorsal kyphoscoliosis, and other skeletal defects. ... (05 Mar 2000) ...

trisomy 21
<genetics, molecular biology> A congenital condition which is characterised by moderate to severe mental retardation, slanting eyes, a broad short skull, broad hands and short fingers. ... Other congenital abnormalities include heart defects, oesophageal atresia and an increased incidence of acute lymphocytic leukaemia. All of these findings a …

trisomy 21 syndrome
<syndrome> A common chromosome disorder due to an extra chromosome number 21 (trisomy 21). The syndrome causes mental retardation, a characteristic face, and multiple malformations. It is associated with a major risk for heart problems, a lesser risk of duodenal atresia (part of the intestines not developed), and a minor but still significant …

trisomy 8 syndrome
<syndrome> Craniofacial dysmorphia, short wide neck but narrow cylindrical trunk, and multiple joint and digital defects. ... (05 Mar 2000) ...

trisomy C syndrome
<syndrome> Trisomy for any chromosome of group C, numbers 6 through 12, most often number 8. ... (05 Mar 2000) ...

trisomy D syndrome
Synonym for trisomy 13 syndrome ... <syndrome> A condition with three rather than the normal two chromosomes 13. Children born with this syndrome have multiple malformations and mental retardation due to the extra chromosome 13. The congenital malformations (birth defects) commonly include scalp defects, haemangiomas (blood vessel malformation …

tristichia
Presence of three rows of eyelashes. ... Origin: G. Tristichos, in three rows, fr. Tri-, three, + stichos, row ... (05 Mar 2000) ...

tristichous
<botany> Arranged in three rows on a stem, each row in the same plane. ... (09 Oct 1997) ...

tristylous
<botany> Heterostylous species having three style lengths (short, mid, long), the flowers of any one plant having styles of the same length. ... (09 Oct 1997) ...

trisulcate
Marked by three grooves. ... (05 Mar 2000) ...

tritanomaly
A type of partial colour deficiency due to a deficiency or abnormality of blue-sensitive retinal cones. ... Origin: G. Tritos, third, + anomalia, irregularity ... (05 Mar 2000) ...

tritanopia
Deficient colour perception in which there is an absence of blue-sensitive pigment in the retinal cones. ... Origin: G. Tritos, third, + an-priv. + ops, eye ... (05 Mar 2000) ...

triterpenes
Hydrocarbons or their derivatives formed by the condensation of six isoprene units (equivalent to three terpene units) and containing, therefore, 30 carbon atoms; e.g., squalene, certain steroids, cardiac glycosides. ... (05 Mar 2000) ...

trithionate hydrolase
<enzyme> Converts trithionate to thiosulfate + sulfate the 2h+ ... Registry number: EC 3.12.1.1 ... (26 Jun 1999) ...

tritiated
Containing atoms of tritium (hydrogen-3) in the molecule. ... (05 Mar 2000) ...

tritiated thymidine
Thymidine containing the hydrogen radionuclide, tritium (H); used as a marker to measure and localise by radioautography the synthesis of DNA, into which it is incorporated. ... (05 Mar 2000) ...

triticeal cartilage
A rounded nodule of cartilage, the size of a grain of wheat, occasionally present in the posterior margin of the lateral thyrohyroid ligament. ... Synonym: cartilago triticea, corpus triticeum, triticeum. ... (05 Mar 2000) ...

triticeoglossus
See: musculus triticeoglossus. ... Origin: L. Triticeum, + G. Glossa, tongue ... (05 Mar 2000) ...

triticeous
Resembling or shaped like a grain of wheat. ... Origin: L. Triticeus, fr. Triticum, a grain of wheat ... (05 Mar 2000) ...

triticeum
Synonym: triticeal cartilage. ... Origin: L. Triticeus, triticeous, like a grain of wheat ... (05 Mar 2000) ...

tritium
<physics, radiobiology> Long lived radioactive isotope of hydrogen (half life 12.26 years). ... Weak emitter, very suitable for autoradiography and relatively easy to incorporate into complex molecules. ... (18 Nov 1997) ...

tritium inventory
<radiobiology> Total quantity of tritium stored in a facility. Minimising this radioactive inventory is a key reactor design issue. ... (09 Oct 1997) ...

tritium-breeding ratio
<radiobiology> The amount of tritium generated by the breeding blanket of a D-T fusion reactor, divided by the amount of tritium burned in the reactor. A tritium breeding ration greater than unity is necessary for self-sufficient fueling. ... (09 Oct 1997) ...

tritocaline
Synonym for tritoqualine ... 7-amino-4,5,6-triethoxy-3-(5,6,7,8-tetrahydro-4-methoxy-6-methyl-1,3-dioxolo[4,5-g]isoquinolin-5-yl)phthalide;an antihistaminic. ... Synonym: tritocaline. ... (05 Mar 2000) ...

tritolyl phosphates
Phosphoric acid tri(methylphenyl) ester. A mixture of isomeric tritolyl phosphates. Used in the sterilization of certain surgical instruments and in many industrial processes. ... (12 Dec 1998) ...

triton
<radiobiology> The nucleus of a tritium atom, tritium ion. ... See: tritium. ... (09 Oct 1997) ...

triton tumour
A peripheral nerve tumour with striated muscle differentiation, seen most often in neurofibromatosis; named after Masson's theory of transformation of motor nerve fibres into muscle in triton salamanders. ... (05 Mar 2000) ...

Triton X 100
<chemical> Nonionic detergent used in isolating membrane proteins: the detergent replaces the phospholipids that normally surround such a protein. ... Other detergents of the Triton group are occasionally used so the full name should be quoted. ... (18 Nov 1997) ...

tritoqualine
7-amino-4,5,6-triethoxy-3-(5,6,7,8-tetrahydro-4-methoxy-6-methyl-1,3-dioxolo[4,5-g]isoquinolin-5-yl)phthalide;an antihistaminic. ... Synonym: tritocaline. ... (05 Mar 2000) ...

tritrichomonas
A genus of flagellate protozoans possessing three long anterior flagella. ... (12 Dec 1998) ...

tritrichomonas foetus
A species of flagellate parasitic protozoa. It possesses a long undulating membrane that is bordered on its outer margin by a flagellum that becomes free posteriorly. This organism causes infections in cows that could lead to temporary infertility or abortion. ... (12 Dec 1998) ...

tritubercular
Synonym for tricuspid ... 1. Having three cusps, or points; tricuspidate; as, a tricuspid molar. ... 2. <anatomy> Of or pertaining to the tricuspid valves; as, tricuspid obstruction. ... <anatomy> Tricuspid valve, the valve, consisting of three triangular membranous flaps, at the opening of the right auricle into the right ventricle in the …

triturable
Capable of being triturated. ... (05 Mar 2000) ...

triturate
1. To accomplish trituration. ... 2. A triturated substance. ... Tablet triturate, a compressed tablet of a medicated powder dispersed with milk sugar. ... (05 Mar 2000) ...

trituration
1. The act of reducing a drug to a fine powder and incorporating it thoroughly with sugar of milk by rubbing the two together in a mortar. ... Synonym: tripsis. ... 2. Mixing of dental amalgam in a mortar and pestle or with a mechanical device. ... Origin: L. Trituratio, fr. Trituro, to thresh, fr. Tero, pp. Tritus, to rub ... (05 Mar 2000) ...

triturus
A genus of aquatic newts in the salamandridae family. During breeding season many triturus males have a dorsal crest which also serves as an accessory respiratory organ. One of the common triturus species is triturus cristatus (crested newt). ... (12 Dec 1998) ...

triumvir
One of tree men united in public office or authority. ... In later times the triumvirs of Rome were three men who jointly exercised sovereign power. Julius Caesar, Crassus, and Pompey were the first triumvirs; Octavianus (Augustus), Antony, and Lepidus were the second and last. ... Origin: L, fr. Res, gen. Trium, three + vir a man. See Three, and Vir …

trivalent
<chemistry> Having a valence of three. ... Origin: L. Valens = powerful ... (18 Nov 1997) ...

trivalve
Provided with three valves, as a speculum with three diverging blades. ... (05 Mar 2000) ...

trivet
1. A tree-legged stool, table, or other support; especially, a stand to hold a kettle or similar vessel near the fire; a tripod. ... Alternative forms: trevet. ... 2. A weaver's knife. See Trevat. Trivet table, a table supported by three legs. ... Origin: Probably through French fr. L. Tripes, -edis, three-footed; tri- (see Tri-)+ pes, pedis, foot: cf …

trivial name
A name of a chemical, no part of which is necessarily used in a systematic sense; i.e., it gives little or no indication as to chemical structure. Such names are common for drugs, hormones, proteins, and other biologicals, and are used by the general public. They may not be officially sanctioned, in contrast to nonproprietary names, but may be adop …

trizonal
Having, or arranged in, three zones or layers. ... (05 Mar 2000) ...

trk
<oncogene> Oncogene, from human colon carcinoma, encoding a receptor tyrosine kinase. ... The trk gene product is a receptor for NGF, that of the trkB gene the receptor for neurotrophin 4 and BDNF and the trkC gene the receptor for NT 3. ... (18 Nov 1997) ...

tRNA
Synonym for transfer RNA ... rNA ...

tRNA 2-selenouridine synthase
<enzyme> Catalyses the conversion of a 5-methylaminomethyl-2-thiouridine in tRNA to 5-methylaminomethyl-2-selenouridine ... Registry number: EC 2.8.1.- ... (26 Jun 1999) ...

tRNA 3'-processing endonuclease
<enzyme> Involved in processing precursor tRNA from eukaryotic nuclei and organelles between nucleotides 74 and 75 to give 3'c-oh ... Registry number: EC 3.1.27.- ... (26 Jun 1999) ...

tRNA excision ligase
<enzyme> Processes pre-tRNA-tyr into mature tRNA-tyr ... Registry number: EC 6.5.1.- ... (26 Jun 1999) ...

tRNA guanylyltransferase
<enzyme> From saccharomyces cerevisiae or drosophila melanogaster; during the biosynthesis of eukaryotic histidine tRNA, the enzyme adds a guanylate moiety to the 5'-end of histidine tRNA in a posttranscriptional modification ... Registry number: EC 2.7.7.- ... Synonym: histidine tRNA guanylyltransferase ... (26 Jun 1999) ...

tRNA methyltransferases
<enzyme> Enzymes that catalyze the s-adenosyl-l-methionine-dependent methylation of ribonucleotide bases within a transfer RNA molecule. ... Registry number: EC 2.1.1.- ... (12 Dec 1998) ...

tRNA nucleotidyltransferase
<enzyme> EC 2.7.7.21 (tRNA cytidylyltransferase) and EC 2.7.7.25 (tRNA adenylyltransferase) may be identical ... Registry number: EC 2.7.7.- ... Synonym: ctp(ATP)-tRNA nucleotidyltransferase, tRNA adenylyltransferase, tRNA cytidylyltransferase, ATP(ctp)-tRNA nucleotidyltransferase, transfer RNA nucleotidyltransferase, cca-adding enzyme ... (26 J …

tRNA pseudouridine synthetase
<enzyme> Converts tRNA-uridine to tRNA-pseudouridine by intramolecular rearrangement of ribose from n-1 to c-5 position of uracil at positions 38, 39 and 40 of nearly all trnas ... Registry number: EC 5.4.99.12 ... Synonym: pseudoridine synthase I, pus4 gene product, ynl292w gene product ... (26 Jun 1999) ...

tRNA splicing ligase
<enzyme> One of two enzymes involved in tRNA splicing in archaea ... Registry number: EC 6.5.1.- ... (26 Jun 1999) ...

tRNA sulfurtransferase
<enzyme> Transfers sulfur from beta-mercaptopyruvate to tRNA ... Registry number: EC 2.8.1.4 ... (26 Jun 1999) ...

tRNA(Trp) intron endonuclease
<enzyme> Capable of prescise excision of the 104-nucleotide intron from halobacterial pre-tRNA(trp) substrates generated in vitro by t7 RNA polymerase transcription; produces 5'-hydroxyl and 2',3'-cyclic phosphate termini; from halobacterium volcanii ... Registry number: EC 3.1.27.- ... Synonym: tRNA trp intron endonuclease ... (26 Jun 1999) ...

trocar
<surgery> A stylet, usually with a triangular point, used for exploring tissues or for inserting drainage tubes, as in dropsy. ... Alternative forms: trochar. ... Origin: F. Trocart (or trois-quarts, i. E, three quarters); trois three (L. Tres) + carre the side of a sword blade; so called from its triangular point. ... Source: Websters Dictionar …

troch
<abbreviation> Trochiscus. ... (05 Mar 2000) ...

trochanter major
Synonym for greater trochanter ... A strong process at the proximal and lateral part of the shaft of the femur, overhanging the root of the neck; it gives attachment to the gluteus medius and minimus, piriformis, obturator internus and externus, and gemelli muscles. ... Synonym: trochanter major. ... (05 Mar 2000) ...