pupfishEtymologyFrom pup + fish, said to derive from the mating habits of the males, whose activities vaguely resemble puppies at play.pupfish means Any of a group of small killifish belonging to ten genera of the family Cyprinodontidae. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounAny of a group of small killifish belonging to ten genera of the family Cyprinodontidae.