air gun


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]
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