fraternal twin


noun

one of a pair of twins, not necessarily resembling each other, or of the same sex, that develop from two separately fertilized ova.
Compare identical twin.

Origin of fraternal twin

First recorded in 1900–05

Medical definitions for fraternal twins

fraternal twins

pl.n.

Twins that derive from separately fertilized ova and that have different genetic makeup. They may be of the same or opposite sex.