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).

updated on May 28, 2017

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Definitions of halibut from WordNet

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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.