| bistipuled | <botany> Having two stipules. Origin: Pref. Bi- + stipule. Source: Websters Dictionary (01 Mar 1998) |
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| bistort | <botany> An herbaceous plant of the genus Polygonum, section Bistorta; snakeweed; adderwort. Its root is used in medicine as an astringent. Origin: L. Bis + tortus, p. P. Of torquere to twist: cf. F. Bistorte. Source: Websters Dictionary (01 Mar 1998) |
| bistoury | A long, narrow-bladed knife, with a straight or curved edge and sharp or blunt point (probe-point); used for opening or slitting cavities or hollow structures. Origin: Fr. Bistouri, fr. It. Dialect bistori, perh. Fr. Pistoia, Italy (05 Mar 2000) |
| bistratal | Having two strata or layers. (05 Mar 2000) |
| bistre | A dark brown pigment extracted from the soot of wood. Origin: F. Bistre a colour made of soot; of unknown origin. Cf, however, LG. Biester frowning, dark, ugly. Source: Websters Dictionary (01 Mar 1998) |
| bisulcate | 1. Having two grooves or furrows. 2. <zoology> Cloven; said of a foot or hoof. Origin: Pref. Bi- + sulcate. Source: Websters Dictionary (01 Mar 1998) |
| bisulfate | A salt containing HSO4-. Synonym: acid sulfate. (05 Mar 2000) |
| bisulfide | A compound of the anion HS-; an acid sulfide. (05 Mar 2000) |
| bisulfite | A salt or ion of HSO3-. (05 Mar 2000) |
| bisulphate | <chemistry> A sulphate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal sulphates; an acid sulphate. Origin: Pref. Bi- + sulphate. Source: Websters Dictionary (01 Mar 1998) |
| bisulphide | <chemistry> A sulphide having two atoms of sulphur in the molecule; a disulphide, as in iron pyrites, FeS2; less frequently called bisulphuret. Origin: Pref. Bi- + sulphide. Source: Websters Dictionary (01 Mar 1998) |
| bisulphite | <chemistry> A salt of sulphurous acid in which the base replaces but half the hydrogen of the acid; an acid sulphite. Source: Websters Dictionary (01 Mar 1998) |
| bisulphuret | <chemistry> See Bisulphide. Origin: Pref. Bi- + sulphuret. Source: Websters Dictionary (01 Mar 1998) |