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crayfish

[krey-fish] /ˈkreɪˌfɪʃ/
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
1350-1400; alteration (by folk etymology) of Middle English crevis < Middle French crevice < Old High German krebiz crab1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crayfishes

crayfish

/ˈkreɪˌfɪʃ/
noun (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
Word Origin
C14: cray, by folk etymology, from Old French crevice crab, from Old High German krebiz + fish
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for crayfishes

crayfish

n.

"small, freshwater lobster," early 14c., crevis, from Old French crevice "crayfish" (13c., Modern French écrevisse), probably from Frankish *krebitja or a similar Germanic word that is a diminutive form of the root of crab (n.1); e.g. Old High German krebiz "crab, shellfish," German Krebs. Modern spelling is 16c., under influence of fish (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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