| polyzygotic | Synonym: polyovulatory. Origin: poly-+ G. Zygotos, yoked (05 Mar 2000) |
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| polyzygotic twins | Twin's resulting from fertilization of more than two ova discharged in a single ovulating cycle. Siamese twins, originally, a much publicised conjoined pair of twin's (xiphopagus) from Siam in the 19th century; this term has since come into general lay usage for any type of conjoined twin's, but is incorrect. (05 Mar 2000) |