The Collaborative International Dictionary of English v.0.48:
Firearm \Fire"arm`\ (f[imac]r"[aum]rm`), n. A gun, pistol, or any weapon from which a shot is discharged by the force of an explosive substance, as gunpowder. [1913 Webster]WordNet (r) 3.0 (2006):
firearm n 1: a portable gun; "he wore his firearm in a shoulder holster" [syn: firearm, piece, small-arm]