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fraternal twin

noun
1.
one of a pair of twins, not necessarily resembling each other, or of the same sex, that develop from two separately fertilized ova.
Compare identical twin.
Origin of fraternal twin
1900-1905
First recorded in 1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Contemporary definitions for fraternal twin
noun

nonidentical twins who developed from two separate fertilized eggs; also called dizygotic twin

Dictionary.com's 21st Century Lexicon
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