crayfish

[krey-fish]
noun, plural (especially collectively) crayfish (especially referring to two or more kinds or species) crayfishes.
1.
Also called crawdad, crawdaddy. any freshwater decapod crustacean of the genera Astacus and Cambarus, closely related to but smaller than the lobsters.
2.
any of several similar marine crustaceans, especially the spiny lobster.
Also, crawfish.


Origin:
1350–1400; alteration (by folk etymology) of Middle English crevis < Middle French crevice < Old High German krebiz crab1

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World English Dictionary
crayfish or esp (US) crawfish (ˈkreɪˌfɪʃ)
 
n , pl -fish, -fishes
1.  any freshwater decapod crustacean of the genera Astacus and Cambarus, resembling a small lobster
2.  any of various similar crustaceans, esp the spiny lobster
 
[C14: cray, by folk etymology, from Old French crevice crab, from Old High German krebiz + fish]
 
crawfish or esp (US) crawfish
 
n
 
[C14: cray, by folk etymology, from Old French crevice crab, from Old High German krebiz + fish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

crayfish
c.1400, from O.Fr. crevice (13c.), from Frank. word probably related to crab (cf. O.H.G. krebiz "crab, shellfish"); spelling altered 16c. on influence of fish.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But this bizarre strategy is all part of the mating ritual of the signal
  crayfish.
The predators feed on other fish, as well as small amounts of crab and crayfish.
These nocturnal foragers use lightning-quick paws to grab crayfish, frogs, and
  other aquatic creatures.
Crayfish relieving themselves from an unlikely orifice is one such postulation.
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