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
Words nearby fraternal twin
fratching,
frater,
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fraternal society,
fraternal twin,
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fratricide
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.