bi-

Two in number.

biarticular

biaxial

Having or possessing two of the root word's quality.

biangular

biantheriferous

Both: referring to two as a set.

biacetabular

biallelic

Being different in two ways with respect to the root.

biadjoint

biaffine

Forked, divided by two, halved; (chemistry, proscribed) half

bifurcate

bicapitate

Alternative form of bio-.

biont