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The Collaborative International Dictionary
Potgun

Potgun \Pot"gun`\, n.

  1. A pot-shaped cannon; a mortar. [Obs.] ``Twelve potguns of brass.''
    --Hakluyt.

  2. A popgun. [Obs.]
    --Swift.

Wiktionary
potgun

n. 1 (context obsolete English) A pot-shaped cannon; a mortar. 2 (context obsolete English) A pop gun.