Etymology
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firearm (n.)

also fire-arm, 1640s, from fire (n.) + arm (n.2). Anything which expels a missile by combustion of gunpowder (or a similar substance), from a pistol to a cannon. Related: Firearms.

updated on November 11, 2014

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Definitions of firearm from WordNet

firearm (n.)
a portable gun;
he wore his firearm in a shoulder holster
Synonyms: piece / small-arm
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.