hal·i·but 
(hălə-bət, hŏl-)
(hălə-bət, hŏl-)n. pl. halibut or hal·i·buts
Any of several large edible flatfishes of the genus Hippoglossus and related genera, of northern Atlantic or Pacific waters.
[Middle English : hali, holi, holy (from its being eaten on holy days); see HOLY + butte, flatfish (from Middle Dutch; see bhau- in the Appendix of Indo-European roots).]