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Webster 1913 Edition

Noun.

A pot-shaped cannon; a mortar.

[Obs.]

“Twelve potguns of brass.”

Hakluyt.

A popgun.

[Obs.]

Swift.

, for popgun. [Not used.]

potgun ‎(plural potguns)

(obsolete) A pot-shaped cannon; a mortar.
Twelve potguns of brass. — Hakluyt.
(obsolete) A pop gun.
(Can we find and add a quotation of Swift to this entry?)