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identical twin

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.
Compare fraternal twin.
Origin of identical twin
1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for identical twins
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Historical Examples
  • Even at a distance the Terrans looked disturbingly alike, and when they got closer I could see that they were identical twins.

    Problem on Balak Roger D. Aycock
  • identical twins—one grows old like other people; the other remains young.

    Category Phoenix Boyd Ellanby
  • But there is reason to suppose that identical twins in reality come from the same zygote.

    Being Well-Born Michael F. Guyer
  • At first glance they looked like carbon copies of each other, although they were no more identical than identical twins ever are.

    Gold in the Sky Alan Edward Nourse
  • If they exist, why do not ordinary brothers become as much alike as identical twins?

    Applied Eugenics Paul Popenoe and Roswell Hill Johnson
identical twins in Medicine

identical twins pl.n.
Twins derived from the same fertilized ovum that at an early stage of development becomes separated into independently growing cell aggregations, giving rise to two individuals of the same sex, identical genetic makeup, and closely similar appearance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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