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Definition of Fraternal twin

Fraternal twin: A twin who have shared a common uterine environment with its sibling. Fraternal twins are due to the fertilization of two different ova by different sperm.

Fraternal twins are also called dizygotic twins.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=3518
Last Editorial Review: 6/14/2012

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