| bi | 1. <prefix> In most branches of science bi- in composition denotes two, twice, or doubly; as, bidentate, two-toothed; biternate, doubly ternate, etc. Prefix meaning twice or double, referring to double structures, dual actions, etc. 2. <chemistry> In the composition of chemical names bi- denotes two atoms, parts, or equivalents of that constituent to the name of which it is prefixed, to one of the other component, or that such constituent is present in double the ordinary proportion; as, bichromate, bisulphide. Be- and di- are often used interchangeably. Also used in chemistry to denote a partially neutralised acid (an acid salt); e.g., bisulfate. Origin: L. Bis twice, which in composition drops the -s, akin to E. Two. See Bis-, Two, and cf. Di-, Dis-. Origin: L. Source: Websters Dictionary (20 Jun 2000) |
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| Bi(OH)3 | <abbreviation> Bismuth hydroxide. (05 Mar 2000) |
| bi-bi reaction | A reaction catalyzed by a single enzyme in which two substrates and two products are involved; the ping-pong mechanism may be involved in such a reaction. Compare: mechanism. (05 Mar 2000) |
| bi-leaflet valve | A low profile mechanical heart valve that is less obstructive to outflow, especially in small size. (05 Mar 2000) |
| biacid | <chemistry> Having two hydrogen atoms which can be replaced by negative atoms or radicals to form salts; said of bases. See Diacid. Origin: Pref. Bi- + acid. Source: Websters Dictionary (01 Mar 1998) |
| biacuminate | <botany> Having points in two directions. Origin: Pref. Bi- + acuminate. Source: Websters Dictionary (01 Mar 1998) |
| Bial's test | A test for pentoses with orcinol. Synonym: orcinol test. (05 Mar 2000) |
| Bial, Manfred | <person> German physician, 1869-1908. See: Bial's test. (05 Mar 2000) |
| bialaphos N-acetylhydrolase | <enzyme> Removes the n-acetyl group from bialaphos as one of the final steps in the biosynthetic pathway Registry number: EC 3.5.1.- (26 Jun 1999) |
| Bianchi's nodule | A nodule at the centre of the free border of each semilunar valve at the beginning of the pulmonary artery and aorta. Synonym: nodulus valvulae semilunaris, Arantius' nodule, Bianchi's nodule, corpus arantii, Morgagni's nodule. (05 Mar 2000) |
| Bianchi's valve | A fold of mucous membrane guarding the lower opening of the nasolacrimal duct. Synonym: plica lacrimalis, Bianchi's valve, Hasner's fold, Hasner's valve, Huschke's valve, Rosenmuller's valve. (05 Mar 2000) |
| Bianchi, Giovanni | <person> Italian anatomist, 1681-1761. See: Bianchi's nodule, Bianchi's valve. (05 Mar 2000) |
| biantheriferous | <botany> Having two anthers. Origin: Pref. Bi- + antherigerous. Source: Websters Dictionary (01 Mar 1998) |
| biarticular | Relating to two joints. Synonym: biarticular, diarticular. Origin: G. Di-, two, + arthron, joint (05 Mar 2000) |
| biarticulate | <zoology> Having, or consisting of, tow joints. Origin: Pref. Bi- + articulate. Source: Websters Dictionary (01 Mar 1998) |