| argentaffin | Pertaining to cells or tissue elements that reduce silver ions in solution, thereby becoming stained brown or black. Origin: L. Argentum, silver, + affinitas, affinity (05 Mar 2000) |
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| argentaffin cell | So called because they will form cytoplasmic deposits of metallic silver from silver salts. Their characteristic histochemical behaviour arises from 5 HT, which they secrete. Found chiefly in the epithelium of the gastrointestinal tract (though possibly of neural crest origin) their function is rather obscure, although there is a widely distributed family of such paracrine (local endocrine) cells (APUD cells). (18 Nov 1997) |
| argentaffin cells | Cell's that contain granules which precipitate silver from an ammoniacal silver nitrate solution. See: enteroendocrine cells. (05 Mar 2000) |
| argentaffin granules | Granule's that reduce silver ions from an ammoniacal silver nitrate staining solution. (05 Mar 2000) |
| argentaffinoma | <oncology, tumour> A tumour which secretes excessive amounts of the hormone serotonin. The clinical result is carcinoid syndrome. These tumours may grow anywhere in the gastrointestinal tract (and in the lungs) with approximately 90% in the appendix. The remainder occur in the ileum, stomach, colon or rectum. (27 Sep 1997) |
| argentate | <botany> Silvery white. Origin: L. Argentatus silvered. Source: Websters Dictionary (01 Mar 1998) |
| argentation | Impregnation with a silver salt. See: argyria. Origin: L. Argentum, silver (05 Mar 2000) |
| argentic | <chemistry> Pertaining to, derived from, or containing, silver; said of certain compounds of silver in which this metal has its lowest proportion; as, argentic chloride. Source: Websters Dictionary (01 Mar 1998) |
| argentine | 1. <chemical> A siliceous variety of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure. 2. White metal coated with silver. 3. <zoology> A fish of Europe (Maurolicus Pennantii) with silvery scales. The name is also applied to various fishes of the genus Argentina. 4. A citizen of the Argentine Republic. Origin: Cf. F. Argentin, fr. L. Argentum silver. Source: Websters Dictionary (01 Mar 1998) |
| Argentine haemorrhagic fever virus | A member of the Arenaviridae. (05 Mar 2000) |
| Argentinean haemorrhagic fever | A form of haemorrhagic fever observed in South America, seemingly transmitted by contact from rodents to man and caused by the Junin virus, a member of the family Arenaviridae. (05 Mar 2000) |
| argentite | <chemical> Sulphide of silver; also called vitreous silver, or silver glance. It has a metallic luster, a lead-gray colour, and is sectile like lead. Origin: L. Argentum silver. Source: Websters Dictionary (01 Mar 1998) |
| argentophil | <pathology> Pertaining to tissue elements that are capable of impregnation with silver ions and being made visible after an external reducing agent is used. Synonym: argentophil, argentophile. Origin: G. Argyros, silver, + philos, fond (05 Mar 2000) |
| argentous | <chemistry> Of, pertaining to, or containing, silver; said of certain silver compounds in which silver has a higher proportion than in argentic compounds; as, argentous chloride. Source: Websters Dictionary (01 Mar 1998) |
| argentry | Silver plate or vessels. Origin: F. Argenterie, fr. Argent silver, L. Argentum. Source: Websters Dictionary (01 Mar 1998) |