| cleistogamy | <botany> The condition of having flowers which never open and self-pollination occurs, and the flowers are often small and inconspicuous. (13 Nov 1997) |
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| cleistothecium | In fungi, an ascocarp that is closed, with randomly dispersed asci. Origin: G. Kleistos, enclosed, + theke, box (05 Mar 2000) |
| Cleland nomenclature | A nomenclature for representing the binding mechanisms of enzyme-catalyzed reactions; in this nomenclature, substrates are represented by the letters A, B, C, etc., while products are represented by P, Q, R, etc., enzyme by E, and modified forms of the enzyme by F, G, etc.; in addition, the number of substrates or products is represented by uni, bi, ter, etc.; thus, an aminotransferase reaction (e.g., alanine transaminase) has a ping-pong bi bi mechanism; glutamine synthetase has been reported to have a random ter ter mechanism.subentries under mechanism. (05 Mar 2000) |
| 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) |
| 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) |