CRAYFISH Meaning of CRAYFISH in English n. (pl. same) 1 a small lobster-like freshwater crustacean. 2 a crawfish. [ ME f. OF crevice, crevis, ult. f. OHG krebiz CRAB(1): assim. to FISH(1) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012