Bull"dog` (?), 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.
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.
© Webster 1913.
Bull"dog`, a.
Characteristic of, or like, a bulldog; stubborn; as, bulldog courage; bulldog tenacity.
Bulldog bat zo'94l., a bat of the genus Nyctinomus; -- so called from the shape of its face.
© Webster 1913.