Origin of capercailliefrom Gaelic capull coille, literally , horse of the woods from capull, horse ( from Classical Latin caballus: see cavalier) + coille, forest
A large grouse (Tetrao urogallus), native to northern Europe and having dark plumage and a fanlike tail. Also called wood grouse .
Origin of capercaillieScottish Gaelic capull coille capull horse ( from Middle Irish capall ) ( from Old Irish) ( ultimately from Latin caballus ) ( of Celtic origin ) coille genitive of coille forest ( from Old Irish caill )
A Scots corruption of Scottish Gaelic capull coille (“horse of the woods”).