Halibut \Hal"i*but\ (h[o^]l"[i^]*b[u^]t; 277), n. [OE. hali holy
   + but, butte, flounder; akin to D. bot, G. butte; cf. D.
   heilbot, G. heilbutt. So named as being eaten on holidays.
   See {Holy}, {Holiday}.] (Zool.)
   A large, northern, marine flatfish ({Hippoglossus vulgaris}),
   of the family {Pleuronectidae}. It often grows very large,
   weighing more than three hundred pounds. It is an important
   food fish. [Written also {holibut}.]
   
[1913 Webster]