Twin-

Origin

From twin.

Full definition of twin-

Prefix

1. of or relating to twins or being a twin.Whose mother is twin-sister to the Sacred Cow, and whose grandmother is the Lotos of Seven Virtues! —The Atlantic Monthly, Volume 01, No. 03, January, 1858
2. having or consisting of two, double, twofolda twin-engine planeThis boat is twinhulled.
3. existing as a pairThey require a twin-bed accommodation.''