The Collaborative International Dictionary of English v.0.48:

Devilfish \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.
       [1913 Webster]