HALIBUT Meaning of HALIBUT in English n. (also holibut) (pl. same) a large marine flat-fish, Hippoglossus vulgaris, used as food. [ ME f. haly HOLY + BUTT(3) flat-fish, perh. because eaten on holy days ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012