Definition of crayfishes:
(n) :
Any of numerous freshwater decapod crustaceans in superfamily Astacoidea or Parastacoidea, resembling the related lobster but usually much smaller.
(n) :
(New England, Pennsylvania, Upper Midwestern US) A freshwater crustacean (family Cambaridae), sometimes used as an inexpensive seafood or as fish bait.
(n) :
(Australia) A freshwater crayfish (family Parastacidae), such as the gilgie, marron, or yabby.
(n) :
(Australia, New Zealand, South Africa) A rock lobster (family Palinuridae).
(n) :
(Singapore) The species Thenus orientalis of the slipper lobster family (Scyllaridae).
(v) :
(intransitive) To catch crayfish.