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. 2013.
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WordNet
identical twin

noun
either of two twins developed from the same fertilized ovum (having the same genetic material) 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Identical twin is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a scrap or morsel of food left at a meal.
Example sentences
For example, compare identical twin correlations on a trait with fraternal twin
  correlations.
Each identical twin had virus populations that didn't resemble those of their
  sibling-or anybody else, for that matter.
Police have a homicide and a witness, but the likely suspect has an identical
  twin.
So the first one is identical twin studies done with humans that were separated
  at birth.
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