identical twin: Meaning and Definition of

iden'tical twin'

Pronunciation: [key]
  1. one of a pair of twins who develop from a single fertilized ovum and therefore have the same genotype, are of the same sex, and usually resemble each other closely. Cf. fraternal twin.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.