butor

bittern (bird of the family Ardeidae and genus Botaurus, specifically those species not formerly in the genus Ixobrychus, which are called blongios); boor, oaf

From Middle French butor, from Old French butor, from Vulgar Latin *butitaurus, from Latin būtiō (“bittern”) + taurus (“bull”), because of its deep booming call; compare also Middle Dutch watervar (“bittern”, literally “water bull”).