'Derringer' definitions:

Definition of 'derringer'

From: WordNet
noun
A pocket pistol of large caliber with a short barrel

Definition of 'Derringer'

From: GCIDE
  • Derringer \Der"rin*ger\, n. [From the American inventor.] A kind of short-barreled pocket pistol, of very large caliber, often carrying a half-ounce ball. [1913 Webster]