crayfish

Short definition from Wiktionary

Noun

1. 1
   Any of numerous freshwater decapod crustaceans in superfamily Astacoidea or Parastacoidea, resembling the related lobster but usually much smaller.
2. 2
   Any of numerous freshwater decapod crustaceans in superfamily Astacoidea or Parastacoidea, resembling the related lobster but usually much smaller: A freshwater crustacean (family Cambaridae), sometimes used as an inexpensive seafood or as fish bait.
3. 3
   A rock lobster (family Palinuridae).
4. 4
   A freshwater crayfish (family Parastacidae), such as the gilgie, marron, or yabby.
5. 5
   The species Thenus orientalis of the slipper lobster family (Scyllaridae).

Verb

1. 1
   To catch crayfish.
2. 2
   Alternative spelling of crawfish (to backpedal, desert, or withdraw).