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fraternal twin

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
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for fraternal twins
Historical Examples
  • If they were fraternal twins, we'd just name them as if they'd been ordinary brothers or sisters or whatever.

    Anything You Can Do ... Gordon Randall Garrett
Contemporary definitions for fraternal twins

nonidentical twins who developed from two separate fertilized eggs; also called dizygotic twin's 21st Century Lexicon
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fraternal twins in Medicine

fraternal twins pl.n.
Twins that derive from separately fertilized ova and that have different genetic makeup. They may be of the same or opposite sex.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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