prefix
Two in number.
Having or possessing two of the root word's quality.
Both: referring to two as a set.
Being different in two ways with respect to the root.
Forked, divided by two, halved; (chemistry, proscribed) half
Double, twofold.
(LGBTQ) Bisexual, relating to bisexuality.
(anatomy) Bilateral, on both sides of the body.
Twice.
Every two; a rate of once every two.
A pair of; composed of two.
(chemistry) Used for the digit two to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.
prefix
(before a vowel) Alternative form of bio-.