Bi, prefixed to any word, signifies two.
Biangulated, having two corners or angles.
Bicuspid, having two points.
Bidentate, having two teeth.
Bifid, opening with a cleft.
Bifarious, parting in opposite directions.
Bilabiate, furnished both with an outer and inner lip.
Bilobate, divided into two lobes.
Bimarginate, furnished with a double margin as far as the lip.
Biradiate, having two rays.