Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of several small New World freshwater fishes of the genus Fundulus, related to the killifishes.
  • n. Any of various small viviparous New World fishes of the family Poeciliidae, of fresh or brackish waters.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the ray-finned fish in the taxonomic family Fundulidae

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. freshwater fish of Central America having a long swordlike tail; popular aquarium fish
  • n. small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control

Etymologies

So called because it swims near the surface of the water.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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