Meaning of frostfish

frost•fish

Pronunciation: (frôst'fish", frost'-), [key]
— pl. -fish, -fish•es.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.