Bi.

Bi. [From Lat. bis, twice, which in composition drops the s.]

1Sense 1. In most branches of science, bi in composition denotes two, twice, doubly; as, bidentate, two-toothed; biternate, doubly ternate, &c.

2Sense 2. (Chem.) Bi in composition denotes that the compound contains two parts or equivalents of the first-mentioned ingredient to one of the other; thus, a bichromate of potash contains two parts of chromic acid to one of potash.