| Cleland's reagent | <chemical> A reagent commonly used in biochemical studies as a protective agent to prevent the oxidation of sh (thiol) groups and for reducing disulphides to dithiols. Pharmacological action: sulfhydryl reagents, expectorants. Chemical name: 2,3-Butanediol, 1,4-dimercapto-, (R*,R*)- (12 Dec 1998) |
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| clemastine | <chemical> Histamine h1 antagonist used as the hydrogen fumarate in hay fever, rhinitis, allergic skin conditions, and pruritus. It causes drowsiness. Pharmacological action: anti-allergic agents, antipruritics, histamine h1 antagonists. Chemical name: Pyrrolidine, 2-(2-(1-(4-chlorophenyl)-1-phenylethoxy)ethyl)-1-methyl-, (R-(R*,R*))- (12 Dec 1998) |
| clemizole | 1-Chlorobenzyl-2-(1-pyrrolidinylmethyl)benzimidazole;an antihistaminic. (05 Mar 2000) |
| clenbuterol | <chemical> A substituted phenylaminoethanol that has beta-2 adrenomimetic properties at very low doses. It is used as a bronchodilator in asthma. Pharmacological action: adrenergic beta-agonists, bronchodilator agents, sympathomimetic. Chemical name: Benzenemethanol, 4-amino-3,5-dichloro-alpha-(((1,1-dimethylethyl)amino)methyl)- (12 Dec 1998) |
| clenched fist sign | <clinical sign> In angina pectoris, pressing of the clenched fist against the chest to indicate the constricting, pressing quality of the pain. (05 Mar 2000) |
| cleoid | A dental instrument with a pointed elliptical cutting end, used in excavating cavities or carving fillings and waxes. Origin: A. S. Cle, claw + G. Eidos, resemblance (05 Mar 2000) |
| cleptoparasite | A parasite that develops on the prey of the parasite's host. Origin: G. Klepto, to steal, + parasite (05 Mar 2000) |
| Cleret | M., 20th century French physician. See: Launois-Cleret syndrome. (05 Mar 2000) |
| clerical spectacles | Spectacles, used for reading, in which the upper portion of the lenses are removed. Synonym: clerical spectacles, pantoscopic spectacles, pulpit spectacles. (05 Mar 2000) |
| Clevenger | Shobal V., U.S. Neurologist, 1843-1920. See: Clevenger's fissure. (05 Mar 2000) |
| Clevenger's fissure | The sulcus on the basal aspect of the temporal lobe that separates the fusiform gyrus from the inferior temporal gyrus on its lateral side. Synonym: sulcus temporalis inferior, Clevenger's fissure. (05 Mar 2000) |
| click | A slight sharp sound. Ejection click, a clicking ejection sound. See: sound. Mitral click, the opening snap of the mitral valve. Systolic click, a sharp, clicking sound heard during cardiac systole; when heard in early systole it is usually an ejection sound; in late systole the click usually signifies mitral insufficiency, as in the dysfunction of the mitral valvular apparatus when it prolapses into the left atrium during systole (see Barlow syndrome); rarely may also be due to pleuropericardial adhesions or other extracardiac mechanisms. (05 Mar 2000) |
| click syndrome | <syndrome> A syndrome, particularly of the atrioventricular valves, in which systole causes a sudden tensing of a scallop of a valve or an entire cusp producing the auscultatory click. Synonym: valvular prolapse. (05 Mar 2000) |
| click-murmur syndrome | <syndrome> Mitral valve prolapse (also known as Barlow's syndrome ), the most common heart valve abnormality, affecting 5-10% of the world population. Most patients have no symptoms and require no treatment, but some have fatigue and/or palpitations. The mitral valve prolapse can often be detected by a doctor during examination of the heart and confirmed with an echocardiogram. Patients are usually given antibiotics prior to any procedure which might introduce bacteria into the bloodstream, including dental work and minor surgery, because of an increased risk of infection of the abnormal heart valve. (12 Dec 1998) |
| clicking | A snapping, crepitant noise noted on excursions of the temporomandibular articulation, due to an asynchronous movement of the disk and condyle. (05 Mar 2000) |