killifish definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
killifish definition by American Heritage Dictionary
noun pl. killifish killifish or kil·li·fish·es
Any of numerous small fishes of the family Cyprinodontidae, including the guppy and mosquito fish, inhabiting chiefly fresh and brackish waters in warm regions.
Origin: Perhaps kill2 + fish.
Variant of killifish