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either of a pair of twins who develop from a single fertilized ovum and therefore have the same genotype, are of the same sex, and usu. resemble each other closely. Compare fraternal twin.
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|Noun||1.||identical twin - either of two twins developed from the same fertilized ovum (having the same genetic material)|
conjoined twin, Siamese twin - one of a pair of identical twins born with their bodies joined at some point
twin - either of two offspring born at the same time from the same pregnancy
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