| Catha edulis | A plant of Ethiopia and Arabia (family Celastraceae), cultivated for use as a stimulant; khat (the fresh leaves and twigs) is chewed or used in the preparation of a beverage; the active principle is pharmacologically related to the amphetamines, probably d-norisoephedrine. Origin: Ar. Khat (05 Mar 2000) |
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| Catharanthus alkaloids | <chemical> A class of alkaloids from the genus of apocyanaceous woody herbs including periwinkles. They are some of the most useful antineoplastic agent. Pharmacological action: antineoplastic agent, phytogenic, vasodilator agents. (12 Dec 1998) |
| catharsis | The release of ideas, thoughts, and repressed material from the unconscious, accompanied by an emotional response and relief. (12 Dec 1998) |
| cathartic | <pharmacology> Medications, through their chemical effects, that serve to increase the clearing of intestinal contents. Synonym: laxative. (16 Mar 1998) |