HALIBUT

[hal.i.but] n, pl halibut also halibuts [ME halybutte, fr. haly, holy holy + butte flatfish, fr. MD or MLG but; fr. its being eaten on holy days] (14c): any of several marine flatfishes (esp. Hippoglossus hippoglossus of the Atlantic and H. stenolepis of the Pacific) that are widely used for food and include some of the largest bony fishes