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swordtail Line breaks: sword|tail
Pronunciation: /ˈsɔːdteɪl/

Definition of swordtail in English:


A live-bearing freshwater fish of Central America, popular in aquaria. The lower edge of the tail is elongated and brightly marked in the male.
  • Xiphophorus helleri, family Poeciliidae
Example sentences
  • Many fish lay eggs, but some - including common aquarium fish such as guppies, swordtails, and mollies - retain the eggs inside their bodies until hatching.
  • Such video techniques have been particularly effective in female mate choice studies in fishes, including guppies, sticklebacks, and swordtails.
  • Poeciliids, namely guppies and swordtails, are favorite subjects of sexual selection studies, in particular those concerning mate choice and its role in the maintenance of male secondary sex traits.

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