mə̇ˈkȯi noun
( -s )
Usage: usually capitalized M & 2d C
Etymology: alteration (influenced by the name McCoy ) of Scots Mackay (in the real Mackay the true chief of the Mackay clan — a position often a matter of dispute between the two branches of the clan)
: the real or genuine thing : something that is neither an imitation nor an inferior substitute — used with the definite article