| American Type Culture Collection | <cell culture> A key resource for cultured cells, located in Rockville, USA. (12 Dec 1998) |
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| americas | <geography> The general name for north america, central america, and south america unspecified or combined. (12 Dec 1998) |
| americium | <chemical, element> Americium. A completely man-made radioactive actinide with atomic symbol am, atomic number 95, and atomic weight 243. Its valence can range from +3 to +6. Because of its nonmagnetic ground state, it is an excellent superconductor. It is also used in bone mineral analysis and as a radiation source for radiotherapy. Chemical name: Americium Atomic weight: 243 (12 Dec 1998) |
| amerism | The condition or quality of not dividing into parts, segments, or merozoites. Origin: G. A-priv. + meros, part (05 Mar 2000) |
| ameristic | Endowed with amerism; not dividing into parts or segments. (05 Mar 2000) |
| Ames assay | <procedure> One of a number of procedures used to test substances for likely ability to cause cancer that combines the use of animal tissue to generate active metabolites of the substance with a test for mutagenicity in bacteria. (18 Nov 1997) |
| Ames test | <procedure> One of a number of procedures used to test substances for likely ability to cause cancer that combines the use of animal tissue to generate active metabolites of the substance with a test for mutagenicity in bacteria. (18 Nov 1997) |
| Ames, Bruce | <person> U.S. Molecular geneticist, *1928. See: Ames assay, Ames test. (05 Mar 2000) |
| ametabola | <zoology> A group of insects which do not undergo any metamorphosis. Alternative forms: Ametabolia. Source: Websters Dictionary (01 Mar 1998) |
| ametabolian | <zoology> Of or pertaining to insects that do undergo any metamorphosis. Origin: Gr. Unchangeable; priv. + changeable, to change. Source: Websters Dictionary (01 Mar 1998) |
| ametabolous | <zoology> Not undergoing any metamorphosis; as, ametabolic insects. Source: Websters Dictionary (01 Mar 1998) |
| amethopterin | <drug> A folic acid analogue and inhibitor of dihydrofolate reductase. A potent cytotoxic agent used in the treatment of acute leukaemia. (18 Nov 1997) |
| amethyst | 1. <chemical> A variety of crystallized quartz, of a purple or bluish violet colour, of different shades. It is much used as a jeweler's stone. Oriental amethyst, the violet-blue variety of transparent crystallized corundum or sapphire. 2. A purple colour in a nobleman's escutcheon, or coat of arms. Origin: F. Ametiste, amatiste, F. Amethyste, L. Amethystus, fr. Gr. Without drunkenness; as a noun, a remedy for drunkenness, the amethyst, supposed to have this power; priv. + to be drunken, strong drink, wine. See Mead. Source: Websters Dictionary (01 Mar 1998) |
| ametria | <embryology, gynaecology> The congenital absence of the uterus. (05 Feb 1998) |
| ametriodinic acid | <chemical> 3-acetamido-5-(acetamidomethyl)-2,4,6-triiodobenzoic acid. An ionic monomeric contrast medium. Pharmacological action: contrast media. Chemical name: Benzoic acid, 3-(acetylamino)-5-((acetylamino)methyl)-2,4,6-triiodo- (12 Dec 1998) |