bi-

1. having two biangular, bicapsular
2. doubly, on both sides, in two ways or directions biconvex, bilingual
3. coming, happening, or issued every two (specified periods) biennial, biweekly
4. coming, happening, or issued twice during every (specified period): often replaced by semi- or half-, to avoid confusion with preceding sense bimonthly, biyearly
5. using two or both bilabial, bimanual
6. joining two, combining or involving two bilateral, bipartisan
7. Bot., Zool. twice, doubly, in pairs bifurcate, bipinnate
8. Chem.: usually replaced by di- (sense ) except in the names of acid salts [potassium bitartrate]
   1. having twice as many atoms or chemical equivalents for a definite weight of the other constituent of the compound sodium bicarbonate
   2. in organic compounds, having a combination of two radicals of the same composition biphenyl

bio-