| oct- | Eight. Origin: G. Okto, L. Octo (05 Mar 2000) |
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| OCTA | An eight-base pair sequence in DNA that has a regulatory role; for example, if it is artificially appended to a gene, it will cause that gene to be preferentially expressed in cells of the beta-lymphocyte lineage. (05 Mar 2000) |
| octacosanoic acid | CH3-(CH2)26-COOH;a long-chain fatty acid; found in waxes. Synonym: montanic acid. (05 Mar 2000) |
| octad | <chemistry> An atom or radical which has a valence of eight, or is octavalent. Origin: Gr, the number eight. Source: Websters Dictionary (01 Mar 1998) |
| octaemeron | A fast of eight days before a great festival. Origin: NL, fr. Gr, neut. Of of the eighth day. Source: Websters Dictionary (01 Mar 1998) |
| octagon | 1. <geometry> A plane figure of eight sides and eight angles. 2. Any structure (as a fortification) or place with eight sides or angles. Regular octagon, one in which the sides are all equal, and the angles also are all equal. Origin: Gr. Eight-cornered; (for eight) + an angle: cf.F. Cctogone. Source: Websters Dictionary (01 Mar 1998) |
| octagynous | <botany> Having eight pistils or styles; octogynous. Origin: Octa- + Gr. Wife. Source: Websters Dictionary (01 Mar 1998) |
| octahedral | Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage. <chemistry> Octahedral borax, magnetite. See: Octahedron. Source: Websters Dictionary (01 Mar 1998) |
| octahedrite | <chemical> Titanium dioxide occurring in acute octahedral crystals. Source: Websters Dictionary (01 Mar 1998) |
| octahedron | <geometry> A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles. Origin: Gr, fr. Eight-side; (for eight) + seat, base, from to sit. Source: Websters Dictionary (01 Mar 1998) |
| octamer binding protein | <protein> Transcription factor that binds to the octamer motif. Examples: mammalian proteins Oct 1, Oct 2. (18 Nov 1997) |
| octamer motif | A DNA motif found in certain promoters that can produce B-cell specific gene expression. Sequence: ATGCAAAT. (18 Nov 1997) |
| octamerous | <biology> Having the parts in eights; as, an octamerous flower; octamerous mesenteries in polyps. Origin: Octa- + Gr. Part. Source: Websters Dictionary (01 Mar 1998) |
| octamethyl pyrophosphoramide | C8H24N4O3P2;a potent irreversible organophosphate cholinesterase inhibitor used as an insecticide. It was prepared for potential use as a nerve gas. Poisoning produces a cholinergic crisis which can be fatal. Synonym: octamethyl pyrophosphoramide. Origin: Gerhard Schrader, Ger. Chemist, + -an (05 Mar 2000) |
| octamylamine | N-Isopentyl-1,5-dimethylhexylamine;an anticholinergic agent. (05 Mar 2000) |