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Meaning of swordtail

sword•tail

Pronunciation: (sôrd'tāl", sōrd'-), [key]
— n.
  1. any of several small, brightly colored, viviparous, freshwater fishes of the genus Xiphophorus, native to Central America, having the lower part of the caudal fin elongated into a swordlike structure: often kept in aquariums.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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