| Cyon's nerve | <anatomy, nerve> A branch of the vagus which ends in the aortic arch and base of the heart; composed entirely of afferent fibres; its stimulation elicits a brainstem reflex which causes slowing of the heart, dilation of the peripheral vessels, and a fall in blood pressure. Synonym: Cyon's nerve, depressor nerve of Ludwig, Ludwig's nerve. (05 Mar 2000) |
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| Cyon, Elie de | <person> Russian physiologist, 1843-1912. See: Cyon's nerve. (05 Mar 2000) |
| cypridophobia | <psychology> Morbid fear of venereal disease or of sexual intercourse. Origin: G. Kypris, Aphrodite, + phobos, fear (05 Mar 2000) |
| cyprinidae | A family of freshwater fish comprising the minnows or carps. (12 Dec 1998) |
| cypriniformes | An order of fish with 26 families and over 3,000 species. This order includes the family cyprinidae, loaches, carp, suckers, and electric fish. (12 Dec 1998) |
| cyprinodontiformes | An order of fish with eight families and numerous species of both egg-laying and livebearing fish. It includes two suborders, adrianichthyoidei (egg layers) and cyprinodontoidei (egg layers and livebearers). The latter suborder comprises cyprinodontidae (egg-laying killifish), goodeidae (mexican livebearers), jenynsiidae (jenynsiids), anablepidae (four-eyed fish), poeciliidae (livebearers). Of the suborder poeciliidae, the guppy and molly belong to the genus poecilia. (12 Dec 1998) |
| cyproheptadine | <chemical> A serotonin antagonist and a histamine h1 blocker used as antipruritic, appetite stimulant, antiallergic, and for the post-gastrectomy dumping syndrome, etc. Pharmacological action: anti-allergic agents, antipruritics, gastrointestinal agents, histamine h1 antagonists, serotonin antagonists. Chemical name: Piperidine, 4-(5H-dibenzo(a,d)cyclohepten-5-ylidene)-1-methyl- (12 Dec 1998) |
| cyproheptadine hydrochloride | 1-Methyl-4-(5-dibenzo-[a,e]-cycloheptatrienylidine)-piperidine;a potent antagonist of histamine and serotonin, with antihistaminic and antipruritic actions. (05 Mar 2000) |
| cyproterone | <chemical> An anti-androgen that, in the form of its acetate (cyproterone acetate), also has progestational properties. It is used in the treatment of hypersexuality in males, as a palliative in prostatic carcinoma, and, in combination with oestrogen, for the therapy of severe acne and hirsutism in females. Pharmacological action: androgen antagonists. Chemical name: 3'H-Cyclopropa(1,2)pregna-1,4,6-triene-3,20-dione, 6-chloro-1,2-dihydro-17-hydroxy-, (1beta,2beta)- (12 Dec 1998) |
| cyproterone acetate | <chemical> An agent with anti-androgen and progestational properties. It is used in the treatment of male sex offenders, precocious puberty, prostatic and ovarian cancer, and severe hirsutism. Pharmacological action: androgen antagonists, antineoplastic agent, contraceptive agents, male, progestational hormones, synthetic. Chemical name: 3'H-Cyclopropa(1,2)pregna-1,4,6-triene-3,20-dione, 17-(acetyloxy)-6-chloro-1,2-dihydro-, (1beta,2beta)- (12 Dec 1998) |
| cyprus | An island republic in the eastern mediterranean sea. Its capital is nicosia. It was colonised by the phoenicians and ancient greeks and ruled successively by the assyrian, persian, ptolemaic, roman, and byzantine empires. It was under various countries from the 12th to the 20th century but became independent in 1960. The name comes from the greek kupros, probably representing the sumerian kabar or gabar, copper, famous in historic times for its copper mines. The cypress tree is also named after the island. (12 Dec 1998) |
| cypsela | A dry, indehiscent, one-seeded fruit formed from an inferior ovary. Compare: achene. (09 Oct 1997) |
| Cys | Symbol for cysteine (half-cystine) or its mono-or diradical. (05 Mar 2000) |
| cyst | <anatomy> Any closed cavity or sac that is lined by epithelium often contains liquid or semi-solid material. Origin: Gr. Kystis = sac, bladder (09 Oct 1997) |
| cyst thyroglossal | A thyroglossal cyst is a fluid-filled sac present at birth and located in the midline of the neck. A thyroglossal cyst is a result of incomplete closure of a segent of a tube-like structure (the thyroglossal duct) that is present, and normally closes, as the embryo develops. A thyroglossal cyst is also called a thyrolingual cyst. (12 Dec 1998) |