boar \ˈbō(ə)r, -ȯ(ə)r, -ōə, -ȯ(ə)\noun (-s) Etymology: Middle English bor, from Old English bār; akin to Old High German & Old Saxon bēr boar 1. a.: the uncastrated male of swine b.: a wild hog (Sus scrofa ) — see wild boar 2.: the male of any of various mammals (as the guinea pig) < the first coon, a big old boar, came trundling into camp — Hugh Fosburgh >