CRAYFISH Meaning of CRAYFISH in English n. (pl. same) 1. a small lobster-like freshwater crustacean. 2 a crawfish. Etymology: ME f. OF crevice, crevis, ult. f. OHG krebiz CRAB(1): assim. to FISH(1) Oxford English vocab. Оксфордский английский словарь. 2012