Vocabulary : Air engine to Air plant

Air engine : An engine driven by heated or by compressed air.
Air gap : An air-filled gap in a magnetic or electric circuit; specif., in a dynamo or motor, the space between the field-magnet poles and the armature; clearance.
Air gas : See under Gas.
Air gun : 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 : A hole to admit or discharge air; specifically, a spot in the ice not frozen over. ;; A fault in a casting, produced by a bubble of air; a blowhole. ;; A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine.

Air jacket : A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming.
Air level : Spirit level. See Level.
Air line : A path through the air made easy for aerial navigation by steady winds.
Air pipe : A pipe for the passage of air; esp. a ventilating pipe.
Air plant : A plant deriving its sustenance from the air alone; an aerophyte.

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