Home › Words › K › killifishkillifish/ˈkɪ.li.fɪʃ/killifish means any of a number of tiny fish in the Cyprinodontiformes order of ray-finned fish.killifish is pronounced /ˈkɪ.li.fɪʃ/.EtymologyFrom killie (“killifish”, perhaps from kill (“channel, creek”)) or kill, + fish.nounAny of a number of tiny fish in the Cyprinodontiformes order of ray-finned fish.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.cyprinodont 71% match — Any of the Cyprinodontidae, a family of fishes including the killifishes or minnows. vs killifish →cyprinodontiform 70% match — Of or pertaining to the order Cyprinodontiformes vs killifish →cypriniform 63% match — Any of many ray-finned fish, of the order Cypriniformes, such as the carps, minnows and loaches vs killifish →cyprinodontine 63% match — Any pupfish of the subfamily Cyprinodontinae vs killifish →cyprinodontoid 62% match — Any of the family Cyprinodontidae of pupfish. vs killifish →cyprinodontid 62% match — Any fish in the family Cyprinodontidae, the pupfishes. vs killifish →myctophiform 62% match — Belonging to the Myctophiformes order of ray-finned fishes. vs killifish →aplocheilid 61% match — Any killifish in the family Aplocheilidae. vs killifish →