identical twin

noun
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:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
For example, compare identical twin correlations on a trait with fraternal twin
  correlations.
Their findings: an identical twin's behavior could help predict that of his or
  her sibling, but not so with fraternal pairs.
For example, when one genetically identical twin is autistic, the other is
  usually not autistic.
Relativity dictates that when he comes back, he is younger than his identical
  twin brother.
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