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twin

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twin

One of two young produced from a single pregnancy. Human twins may be genetically identical (monozygotic), having been formed from a single fertilized egg that splits into two cells, both of which became implanted. Nonidentical (fraternal or dizygotic) twins are formed when two eggs are fertilized at the same time.

In the US there has been a 52% increase in the number of twin births in the period 1980–97.



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? Mentioned in ? References in classic literature
 
She proceeded to offer this incident in evidence on her twin theory:
A Horse's Tale by Twain, Mark View in context
Jaggers whenever he raised them from the table, and was as dry and distant to me as if there were twin Wemmicks and this was the wrong one.
Great Expectations by Dickens, Charles View in context
One of their company, an old man, said, "Let us cease lamenting, my mates, for, as it seems to me, sorrow is always the twin sister of joy; and it was only to be looked for that we, who just now were over-rejoiced, should next have something to make us sad.
Fables by Aesop View in context
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