bulldog

bulldog is defined in Webster's Unabridged Dictionary (1913) with 2 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Metal.) A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill.
  2. 2.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.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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