/frawst"fish', frost"-/ , n. , pl. ( esp. collectively ) frostfish , ( esp. referring to two or more kinds or species ) frostfishes .
1. either of two North American fishes, the tomcod of the Atlantic Ocean or the round whitefish, that appear when frost sets in.
2. cutlassfish.
[ 1625-35, Amer.; FROST + FISH ]