killifish

noun kil·li·fish \ˈki-li-ˌfish\

Definition of KILLIFISH

: any of a family (Cyprinodontidae) of numerous small oviparous fishes much used as bait and in mosquito control

: any of various live-bearers (family Poeciliidae)

killie killifish (perhaps from ³kill) + fish

First Known Use: 1836

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