Definify.com
Webster 1913 Edition
air gun
air′gunˊ
,air′ gunˊ
(gŭnˊ)
. 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.