Bulldog

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Bulldog

(n.) A variety of dog, of remarkable ferocity, courage, and tenacity of grip; -- so named, probably, from being formerly employed in baiting bulls.
(n.) A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill.
(a.) Characteristic of, or like, a bulldog; stubborn; as, bulldog courage; bulldog tenacity.