Reference Terms
from Wikipedia, the free encyclopedia

Twin

The term twin most notably refers to two individuals (or one of two individuals) who have shared the same uterus (womb) and are usually, but not necessarily, born on the same day.

Twins can be fraternal or identical.

Note:   The above text is excerpted from the Wikipedia article "Twin", which has been released under the GNU Free Documentation License.
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August 4, 2015

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updated 12:56 pm ET