Etymology
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derringer (n.)

"short-barreled, large-caliber pistol," very effective at close range, 1850, for Henry Deringer (1786-1868), U.S. gunsmith who invented it in the 1840s. The prevailing misspelled form is how his name appeared on the many counterfeits and imitations.

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Definitions of derringer

derringer (n.)
a pocket pistol of large caliber with a short barrel;
From wordnet.princeton.edu