Dev·il·fish n. Zool. (a) A huge ray (Manta birostris or  Cephaloptera vampyrus) of the Gulf of Mexico and Southern Atlantic coasts. Several other related species take the same name. See Cephaloptera. (b) A large cephalopod, especially the very large species of Octopus and Architeuthis. See Octopus. (c) The gray whale of the Pacific coast. See Gray whale. (d) The goosefish or angler (Lophius), and other allied fishes. See Angler.
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