Pronunciation: (hal'u-but, hol'-),[key] —n., —pl.(esp. collectively)-but,(esp. referring to two or more kinds or species)-buts. 1. either of two large flatfishes, Hippoglossus hippoglossus, of the North Atlantic, or H. stenolepis, of the North Pacific, used for food.
2. any of various other similar flatfishes. Also,holibut.