(n)a sturdy thickset short-haired breed with a large head and strong undershot lower jaw; developed originally in England for bull baiting, Syn.English bulldog
n. 1. (Zool.) A variety of dog, of remarkable ferocity, courage, and tenacity of grip; -- so named, probably, from being formerly employed in baiting bulls. [ 1913 Webster ]
2. (Metal.) A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill. [ 1913 Webster ]