D defs.my
Entry 1 sense Webster, 1913

airgun

/(gŭn`)/ · air·gun · IPA
01 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…
  1. 1.
    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.