crayfishyoudaoicibaDictYouDict[crayfish 词源字典]
crayfish: [14] The crayfish is related etymologically as well as biologically to the crab. The Old High German word for ‘crab’ was krebiz (source of modern German krebs). This was borrowed into Old French as crevice (modern French has preserved the variant form écrevisse), and transmitted to Middle English as crevis. Association of the final syllable with fish led by the 16th century to its transformation to crayfish (a variant Middle English form cravis became crawfish).
=> crab, crawfish[crayfish etymology, crayfish origin, 英语词源]
crayfish (n.)youdaoicibaDictYouDict
"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); compare Old High German krebiz "crab, shellfish," German Krebs. Modern spelling is 16c., under influence of fish (n.).