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

rickettsiales infections
Infections with bacteria of the order rickettsiales. ... (12 Dec 1998) ...

rickettsialpox
A mild infectious disease first observed in new york city caused by rickettsia akari, transmitted from its mouse host by chigger or adult mite bites. There is fever, a dark spot that becomes a small ulcer at the site of the bite, swollen glands (lymphadenopathy) in that region, and a raised blistery (vesicular) rash. Also known as vesicular rickett …

rickettsias
Obligate intracellular parasites which cause a variety of disease, including typhus and Rocky Mountain spotted fever. ... (09 Oct 1997) ...

rickettsieae
A tribe of gram-negative bacteria of the family rickettsiaceae whose organisms are found in arthropods and are pathogenic for man and certain other vertebrate hosts. ... (12 Dec 1998) ...

rickettsioses
The infectious diseases caused by the rickettsiae. See rickettsial diseases. ... (12 Dec 1998) ...

rickettsiosis
Infection with rickettsiae. ... (05 Mar 2000) ...

rickettsiosis, vesicular
See Rickettsialpox. ... (12 Dec 1998) ...

rickettsiostatic
An agent inhibitory to the growth of Rickettsia. ... Origin: Rickettsia + G. Statikos, bringing to a standstill ... (05 Mar 2000) ...

rickety
Synonym for rachitic ... To do with rickets, a disease caused by Vitamin D deficiency. ... (18 Nov 1997) ...

Rickles test
A colourimetric test for predicting dental caries activity by incubating saliva in sucrose and determining pH changes. ... (05 Mar 2000) ...

Rickles, Norman
<person> U.S. Oral pathologist, *1920. ... See: Rickles test. ... (05 Mar 2000) ...

RID
<abbreviation> Radial immunodiffusion. ... (05 Mar 2000) ...

Rida virus
A variant of the scrapie agent. ... (05 Mar 2000) ...

ride
1. To be carried on the back of an animal, as a horse. 'To-morrow, when ye riden by the way.' (Chaucer) 'Let your master ride on before, and do you gallop after him.' (Swift) ... 2. To be borne in a carriage; as, to ride in a coach, in a car, and the like. See Synonym, below. 'The richest inhabitants exhibited their wealth, not by riding in gilden c …

Rideal-Walker coefficient
A figure expressing the disinfecting power of any substance; it is obtained by dividing the figure indicating the degree of dilution of the disinfectant that kills a microorganism in a given time by that indicating the degree of dilution of phenol which kills the organism in the same space of time under similar conditions. ... Synonym: hygienic labo …

Rideal-Walker method
Synonym for Rideal-Walker coefficient ... A figure expressing the disinfecting power of any substance; it is obtained by dividing the figure indicating the degree of dilution of the disinfectant that kills a microorganism in a given time by that indicating the degree of dilution of phenol which kills the organism in the same space of time under simi …

Rideal, Samuel
<person> English chemist and bacteriologist, 1863-1929. ... See: Rideal-Walker coefficient, Rideal-Walker method. ... (05 Mar 2000) ...

Ridell's operation
Removal of the entire anterior and inferior walls of the frontal sinus, for chronic inflammation of that cavity. ... (05 Mar 2000) ...

rider
1. One who, or that which, rides. ... 2. Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler. ... 3. One who breaks or manages a horse. ... 4. An addition or amendment to a manuscript or other document, which is attached on a separate piece of paper; in legislative practice, an additional clause annexed to a b …

rider's bone
Heterotopic bone ossification of the tendon of the adductor longus muscle from strain in horseback riding. ... Synonym: cavalry bone, exercise bone. ... (05 Mar 2000) ...

rider's bursa
<anatomy> An adventitious bursa on the inner side of the knee caused by horseback riding. ... (05 Mar 2000) ...

rider's leg
A strain of the adductor muscles of the thigh. ... (05 Mar 2000) ...

rider's muscles
The adductor muscle's of the thigh, which come into play especially in horseback riding. ... (05 Mar 2000) ...

ridge
1. A (usually rough) linear elevation. ... See: crest. ... 2. In dentistry, any linear elevation on the surface of a tooth. ... 3. The remainder of the alveolar process and its soft tissue covering after the teeth are removed. ... Origin: A. S. Hyrcg, back, spine ... (05 Mar 2000) ...

ridge extension
An intraoral surgical operation for deepening the labial, buccal, and/or lingual sulci; it is performed to increase the intraoral height of the alveolar ridge in order to assist denture retention. ... (05 Mar 2000) ...

ridge relation
The positional relation of the mandibular ridge to the maxillary ridge. ... (05 Mar 2000) ...

ridge resorption
A loss in the volume and size of the alveolar portion of the mandible or maxilla. ... (05 Mar 2000) ...

ridiculous
1. Fitted to excite ridicule; absurd and laughable; unworthy of serious consideration; as, a ridiculous dress or behavior. 'Agricola, discerning that those little targets and unwieldy glaives ill pointed would soon become ridiculous against the thrust and close, commanded three Batavian cohorts . . . To draw up and come to handy strokes.' (Milton)< …

riding embolism
Synonym for straddling embolism ... Embolism occurring at the bifurcation of an artery and blocking more or less completely both branches. ... Synonym: riding embolism. ... (05 Mar 2000) ...

Ridley, Humphrey
<person> English anatomist, 1653-1708. ... See: Ridley's circle, Ridley's sinus, circulus venosus ridleyi. ... (05 Mar 2000) ...

Ridley's circle
Synonym for circular sinus ... Dural venous formation which surrounds the hypophysis, composed of right and left cavernous sinuses and the intercavernous sinuses. ... Synonym: circulus venosus ridleyi, Ridley's circle. ... A venous sinus at the periphery of the placenta. ... Synonym: sinus venosus sclerae. ... (05 Mar 2000) ...

Ridley's sinus
Synonym for intercavernous sinuses ... The anterior and posterior anastomoses between the cavernous sinus's, passing anterior and posterior to the hypophysis and forming, with the cavernous sinuses, the circular sinus. ... Synonym: sinus intercavernosi, Ridley's sinus. ... Jugular sinus ... Sinus jugularis, one of three enlargements of the jugular vein …

Riedel, Bernhard
<person> German surgeon, 1846-1916. ... See: Riedel's disease, Riedel's lobe, Riedel's struma, Riedel's thyroiditis. ... (05 Mar 2000) ...

Riedel's disease
Synonym for Riedel's thyroiditis ... A rare fibrous induration of the thyroid gland, with adhesion to adjacent structures, which may cause tracheal compression. ... Synonym: chronic fibrous thyroiditis, ligneous struma, ligneous thyroiditis, Riedel's disease, Riedel's struma. ... (05 Mar 2000) ...

Riedel's lobe
An occasional tongue-like process extending downward from the right lobe of the liver lateral to the gallbladder; a similar process may, though rarely, extend from the left lobe. ... Synonym: lobus appendicularis, lobus linguiformis. ... (05 Mar 2000) ...

Riedel's struma
Synonym for Riedel's thyroiditis ... A rare fibrous induration of the thyroid gland, with adhesion to adjacent structures, which may cause tracheal compression. ... Synonym: chronic fibrous thyroiditis, ligneous struma, ligneous thyroiditis, Riedel's disease, Riedel's struma. ... (05 Mar 2000) ...

Riedel's thyroiditis
A rare fibrous induration of the thyroid gland, with adhesion to adjacent structures, which may cause tracheal compression. ... Synonym: chronic fibrous thyroiditis, ligneous struma, ligneous thyroiditis, Riedel's disease, Riedel's struma. ... (05 Mar 2000) ...

Rieder cell leukaemia
A special form of acute granulocytic leukaemia in which the affected tissues and the circulating blood contain relatively large numbers of atypical myeloblasts (i.e., Rieder cells) that have the usual, faintly granular, immature type of cytoplasm, and a bizarre, comparatively mature nucleus with several wide and deep indentations (suggestive of lob …

Rieder cells
Abnormal myeloblasts (12 to 20 um in diameter) in which the nucleus may be widely and deeply indented (i.e., suggestive of lobulation), or may actually be a bi-or multi-lobate structure; such cell's are frequently observed in acute leukaemia, and probably represent a more rapid maturation of the nucleus than that of the cytoplasm. ... (05 Mar 2000)< …

Rieder, Hermann
<person> German pathologist, 1858-1932. ... See: Rieder cells, Rieder cell leukaemia, Rieder's lymphocyte. ... (05 Mar 2000) ...

Rieder's lymphocyte
An abnormal form of lymphocyte that has a greatly indented (or lobed), slightly twisted nucleus; such cells are usually observed in certain examples of chronic lymphocytic leukaemia. ... (05 Mar 2000) ...

Riegel, Franz
<person> German physician, 1843-1904. ... See: Riegel's pulse. ... (05 Mar 2000) ...

Riegel's pulse
A pulse that diminishes in volume during expiration. ... (05 Mar 2000) ...

Rieger, Herwigh
<person> German ophthalmologist. ... See: Rieger's anomaly, Rieger's syndrome. ... (05 Mar 2000) ...

Rieger's anomaly
Synonym for iridocorneal mesodermal dysgenesis ... Mesodermal dysgenesis of cornea and iris, producing pupillary anomalies, posterior embryotoxon, and secondary glaucoma. ... Synonym: Rieger's anomaly. ... (05 Mar 2000) ...

Rieger's syndrome
<syndrome> Iridocorneal mesodermal dysgenesis combined with hypodontia or anodontia and maxillary hypoplasia; autosomal dominant; there is a delayed sexual development and hypothyroidism; there is a deficiency in human growth hormone ... (05 Mar 2000) ...

Riehl, Gustav
<person> Austrian dermatologist, 1855-1943. ... See: Riehl's melanosis. ... (05 Mar 2000) ...

Riehl's melanosis
A brown pigmentary condition of the exposed portions of the skin of the neck and face with melanin pigment in dermal macrophages, thought to result from photodermatitis due to materials, such as cosmetic ingredients, or oils encountered in various occupations. ... (05 Mar 2000) ...

RIF
<abbreviation> Resistance-inducing factor. ... (05 Mar 2000) ...

rifabutin
An oral drug approved by the FDA for preventing MAC in people with AIDS and CD4 cell counts of less than 75. Rifabutin is also used in combination with other drugs for the treatment of active MAC infection. Possible side effects include neutropenia, eye and muscle irritation and a brown-orange discolouration of skin and urine. ... (09 Oct 1997) ...

rifampicin
<drug> Semi synthetic member of the rifamycin group of antibiotics. ... (18 Nov 1997) ...

rifampin
<chemical> A semisynthetic antibiotic used in treatment of tuberculosis. ... Pharmacological action: antibiotics, antitubercular, leprostatic agents. ... Chemical name: Rifamycin, 3-(((4-methyl-1-piperazinyl)imino)methyl)- ... (12 Dec 1998) ...

rifamycin
<drug> Antibiotic produced by Streptomyces mediterranei that acts by inhibiting prokaryotic, but not eukaryotic DNA dependent RNA synthesis. Blocks initiation, but not elongation of transcripts. ... (18 Nov 1997) ...

rifamycin B oxidase
<enzyme> Converts rifamycin b to rifamycin o which spontaneously hydrolyzes to rifamycin s in neutral aqueous media ... Registry number: EC 1.10.3.- ... (26 Jun 1999) ...

rifamycins
<chemical> A group of antibiotics characterised by a chromophoric naphthohydroquinone group spanned by an aliphatic bridge not previously found in other known antibiotics. They have been isolated from fermentation broths of streptomyces mediterranei. ... Pharmacological action: antibiotics. ... (12 Dec 1998) ...

rifle
1. A gun, the inside of whose barrel is grooved with spiral channels, thus giving the ball a rotary motion and insuring greater accuracy of fire. As a military firearm it has superseded the musket. ... 2. A body of soldiers armed with rifles. ... 3. A strip of wood covered with emery or a similar material, used for sharpening scythes. Rifle pit, a tr …

riflebird
<ornithology> Any one of several species of beautiful birds of Australia and new Guinea, of the genera Ptiloris and Craspidophora, allied to the paradise birds. ... The largest and best known species is Ptiloris paradisea of Australia. Its general colour is rich velvety brown, glossed with lilac; the under parts are varied with rich olive gree …

rift valley fever
A febrile disease resembling dengue. It is caused by a mosquito-borne arbovirus. ... (12 Dec 1998) ...

rift valley fever virus
A mosquito-borne species of the phlebovirus genus and member of the sandfly fever group viruses found in eastern, central, and southern africa, producing massive hepatitis, abortion, and death in sheep, goats, cattle, and other animals. It also has caused disease in humans. ... (12 Dec 1998) ...

Riga-Fede disease
Ulceration of the lingual frenum in teething infants, related to abrasion of the tissue against the new central incisors. ... (05 Mar 2000) ...

Riga, Antonio
<person> Italian physician, 1832-1919. ... See: Riga-Fede disease. ... (05 Mar 2000) ...

right
1. That which is right or correct. Specifically: The straight course; adherence to duty; obedience to lawful authority, divine or human; freedom from guilt, the opposite of moral wrong. ... A true statement; freedom from error of falsehood; adherence to truth or fact. 'Seldom your opinions err; Your eyes are always in the right.' (Prior) ... A just j …

right angle clamp
A clamp with a short 90° bend to its tip frequently used for dissection or passage of ligatures around vessels. ... (05 Mar 2000) ...

right aortic arch
<radiology> Types: mirror image branching (95% most likely to be congenital ht disease), 90% tetralogy of Fallot (TOF) (25%) ** decreased PBF, 2.5% truncus (30-50%) ** increased PBF, 1.5% transposition (TGV) (5%), aberrant left subclavian artery (5% most likely to be congenital heart disease) ... (12 Dec 1998) ...

right atrioventricular valve
Synonym for tricuspid valve ... <anatomy> This heart valve, named for its three cusps (leaflets), divides the right atrium and the right ventricle. ... When the right atrium contracts blood flows through the tricuspid valve into the right ventricle. On closure, the tricuspid prohibits the backflow of blood into the right atrium. ... (19 Jan 1998 …

right atrium
<anatomy> The thin-walled chamber of the heart which pumps blood into the right ventricle for ejection into the pulmonary circulation. ... (27 Sep 1997) ...

right atrium of heart
Right atrium, the atrium of the right side of the heart which receives the blood from the venae cavae and coronary sinus. ... Synonym: atrium dextrum cordis. ... (05 Mar 2000) ...

right auricular appendage
Synonym for auricle of right atrium ... The small conical projection from the right atrium of the heart. ... Synonym: auricula dextra, right auricular appendage. ... (05 Mar 2000) ...

right axis deviation
A mean electrical axis of the heart pointing to the right of +90°. ... See: hexaxial reference system. ... (05 Mar 2000) ...

right border of heart
The border between the sternocostal and diaphragmatic surfaces of the heart; it is fairly well defined in fixed hearts but is rounded and indefinite in the living heart. ... Synonym: margo dexter cordis, right margin of heart. ... (05 Mar 2000) ...

right branch
Of a pair of branches, the branch passing to the right side of the body, to the right member of a bilateral pair of structures, or to the right portion of an unpaired structure; the other member of the pair being a left branch. ... Synonym: ramus dexter. ... (05 Mar 2000) ...

right branch of portal vein
<anatomy, vein> Terminal branch of hepatic portal vein distributed to right lobe of liver tributary: cystic vein. ... Synonym: ramus dexter venae portae hepatis. ... (05 Mar 2000) ...

right colic artery
<anatomy, artery> Origin, superior mesenteric, sometimes by a common trunk with the ileocolic; distribution, ascending colon; anastomoses, middle colic, ileocolic. ... Synonym: arteria colica dextra. ... (05 Mar 2000) ...

right colic flexure
The bend of the colon at the juncture of its ascending and transverse portions. ... Synonym: flexura coli dextra, hepatic flexure. ... (05 Mar 2000) ...

right colic lymph nodes
Nodes located along the right colic artery that drain the upper part of the ascending colon. ... Synonym: nodi lymphatici colici dextri. ... (05 Mar 2000) ...

right colic vein
<anatomy, vein> The vein that parallels the right colic artery and drains blood from the ascending colon and right colic flexure. ... Synonym: vena colica dextra. ... (05 Mar 2000) ...

right coronary artery
<anatomy, artery> Origin, right aortic sinus; distribution, it passes around the right side of the heart in the coronary sulcus, giving branches to the right atrium and ventricle, including the atrioventricular branches and the posterior interventricular branch. ... Synonym: arteria coronaria dextra. ... (05 Mar 2000) ...

right coronary artery branches
<radiology> Conus branch, branch to S-A node, acute marginal branches, branches to posterior left ventricle, branch to A-V node, posterior descending artery (patent ductus arteriosus, 90%), hence, right coronary a. Is usually dominant ... (12 Dec 1998) ...

right crus of diaphragm
The muscular origin of the diaphragm from the bodies of the upper three or four lumbar vertebrae that passes upward to the right of the aorta toward the central tendon; the oesophageal hiatus is a parting of the fibres of the right crus to allow passage of the oesophagus. ... Synonym: crus dextrum diaphragmatis. ... (05 Mar 2000) ...

right duct of caudate lobe
The bile duct from the right half of the caudate lobe, a tributary to the right hepatic duct. ... Synonym: ductus lobi caudati dexter. ... (05 Mar 2000) ...

right fibrous trigone
Part of the fibrous skeleton of the heart located between the aortic fibrous ring and rings surrounding the right and left atrioventricular ostia. ... Synonym: trigonum fibrosum dextrum. ... (05 Mar 2000) ...

right gastric artery
<anatomy, artery> Origin, hepatic; distribution, pyloric portion of stomach on the lesser curvature; anastomoses, left gastric. ... Synonym: arteria gastrica dextra, pyloric artery. ... (05 Mar 2000) ...

right gastric lymph nodes
Small nodes along the course of the right gastric artery that drain part of the lesser curvature of the stomach. ... Synonym: nodi lymphatici gastrici dextri. ... (05 Mar 2000) ...

right gastric vein
<anatomy, vein> It receives veins from both surfaces of the upper portion of the stomach, runs to the right along the lesser curvature of the stomach, and empties into the portal vein. ... Synonym: vena gastrica dextra, pyloric vein. ... (05 Mar 2000) ...

right gastro-omental artery
Synonym for right gastroepiploic artery ... <anatomy, artery> Origin, gastroduodenal; distribution, greater curvature and walls of stomach and greater omentum; anastomoses, frequently unites with left gastroepiploic, and branches from this arch anastomose with branches of right and left gastric. ... Synonym: arteria gastro-omentalis dextra, art …

right gastroepiploic artery
<anatomy, artery> Origin, gastroduodenal; distribution, greater curvature and walls of stomach and greater omentum; anastomoses, frequently unites with left gastroepiploic, and branches from this arch anastomose with branches of right and left gastric. ... Synonym: arteria gastro-omentalis dextra, arteria gastroepiploica dextra, right gastro-o …

right gastroepiploic vein
<anatomy, vein> A tributary of the superior mesenteric vein that parallels the right gastroepiploic artery along the greater curvature of the stomach. ... Synonym: vena gastro-omentalis dextra, right gastroomental vein. ... (05 Mar 2000) ...

right gastroomental vein
Synonym for right gastroepiploic vein ... <anatomy, vein> A tributary of the superior mesenteric vein that parallels the right gastroepiploic artery along the greater curvature of the stomach. ... Synonym: vena gastro-omentalis dextra, right gastroomental vein. ... (05 Mar 2000) ...

right heart
The right atrium and right ventricle. ... (05 Mar 2000) ...

right heart bypass
Introduction of a circuit shunting blood from the venae cavae around the right atrium and ventricle and directly into the pulmonary artery. ... (05 Mar 2000) ...

right hepatic artery
<anatomy, artery> Right branch of proper hepatic artery; terminal branch of proper hepatic artery supplying right lobe of liver; branch: cystic artery. ... Synonym: ramus dexter arteriae hepaticae propriae, right branch of proper hepatic artery. ... (05 Mar 2000) ...

right hepatic duct
The duct that transmits bile to the common hepatic duct from the right half of the liver and the right part of the caudate lobe. ... Synonym: ductus hepaticus dexter. ... (05 Mar 2000) ...

right hepatic veins
Veins draining much of the right lobe of the liver (posterior segments [VI & VII] and part of the inferior anterior segment [V]) which merge to form a single or sometimes double trunk, draining into the right side of the suprahepatic portion of the inferior vena cava (between the superior surface of the liver and the diaphragm); when single, it …

right inferior pulmonary vein
<anatomy, vein> The vein returning oxygenated blood from the inferior lobe of the right lung to the left atrium. ... Synonym: vena pulmonalis inferior dextra. ... (05 Mar 2000) ...

right interlobar pulmonary artery
<radiology> Upper limit of normal: 15 mm ... (12 Dec 1998) ...

right lobe
The right subdivision of several glands, e.g., prostate, thyroid, thymus. ... Synonym: lobus dexter. ... (05 Mar 2000) ...

right lobe of liver
The largest lobe of the liver, separated from the left lobe above and in front by the falciform ligament and from the caudate and quadrate lobes by the sulcus for the vena cava and the fossa for the gallbladder; it contains two segments, anterior and posterior. ... Synonym: lobus hepatis dexter. ... (05 Mar 2000) ...

right lumbar lymph nodes
The chain of lymph nodes associated with the inferior vena cava; it is divided into three groups: nodi lymphatici cavales laterales on the right of the inferior vena cava; nodi lymphatici precavales, in front of the inferior vena cava; nodi lymphatici postcavales, under nodus lymphaticus, behind the inferior vena cava. ... Synonym: nodi lymphatici l …

right lung segments
<radiology> Upper lobe, apical, posterior, anterior, middle lobe, lateral, medial, lower lobe, superior, medial basal, posterior basal, lateral basal, anterior basal ... (12 Dec 1998) ...

right lymphatic duct
One of the two terminal lymph vessels, a short trunk, about 2 cm in length, formed by the union of the right jugular lymphatic vessel and vessels from the lymph nodes of the right superior limb, thoracic wall, and both lungs; it lies on the right side of the root of the neck and empties into the right brachiocephalic vein. ... Synonym: ductus lympha …