Air" gas` (&?;). See under Gas.
Air" gun` (gn`). 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.
Air" hole` (hl`). 1. A hole to admit or discharge air; specifically, a spot in the ice not frozen over.