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fraternal twin either of a pair of twins who develop from two zygotes, or fertilized eggs.
identical twin either of two twins formed from the splitting of one zygote, or fertilized egg, and sharing the same genotype at birth.
twin bed either of a matching pair of single beds.
twin bill in baseball, a doubleheader.
twin set a set of a matched cardigan and pullover sweater for women, intended to be worn together.
twin-engine powered by two engines, as an airplane.