swordtail

n.
A small, brightly colored, live-bearing freshwater fish (Xiphophorus helleri) of Central America, having a long tapering extension of the caudal fin in the male and popular in home aquariums.

An aquarium fish, Xiphophorus spp., a member of the suborder Cyprinodontei.

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The noun has one meaning:

Meaning #1: freshwater fish of Central America having a long swordlike tail; popular aquarium fish
  Synonyms: helleri, topminnow, Xyphophorus helleri

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