Etymology
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halibut (n.)

large flatfish, early 15c., perhaps from hali "holy" (see holy) + butte "flatfish" (see butt (n.4)). Supposedly so called from its being eaten on holy days (compare cognate Dutch heilbot, Low German heilbutt, Swedish helgeflundra, Danish helleflynder).

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Definitions of halibut

halibut (n.)
lean flesh of very large flatfish of Atlantic or Pacific;
halibut (n.)
marine food fish of the northern Atlantic or northern Pacific; the largest flatfish and one of the largest teleost fishes;
Synonyms: holibut
From wordnet.princeton.edu