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From The Collaborative International Dictionary of English v.0.48:
airgun \air"gun`\, air gun \air" gun`\(g[u^]n`). A kind of gun in which the elastic force of condensed air is used to discharge the ball. The air is powerfully compressed into a reservoir attached to the gun, by a condensing pump, and is controlled by a valve actuated by the trigger. The common BB gun is a type of air gun. [1913 Webster]