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Bulldog

Definition: A variety of dog, of remarkable ferocity, courage, and
tenacity of grip; -- so named, probably, from being formerly employed
in baiting bulls.

Bulldog

Definition: A refractory material used as a furnace lining, obtained
by calcining the cinder or slag from the puddling furnace of a rolling
mill.

Bulldog

Definition: Characteristic of, or like, a bulldog; stubborn; as,
bulldog courage; bulldog tenacity.