Killifish \Kil"li*fish`\, n. (Zo["o]l.)
Any one of several small American cyprinodont fishes of the
genus {Fundulus} and allied genera. They live equally well in
fresh and brackish water, or even in the sea. They are
usually striped or barred with black. Called also {minnow},
and {brook fish}. See {Minnow}.