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Any system of rudders by which the pilot can exert a turning moment about each of the three rectangular axes of an aëroplane or airship.

A propeller screw placed in front of the supporting planes of an aëroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.

A meteorite or aërolite. [Obs.] Hutton.

Any substance in the gaseous, or aëriform, state, the condition of which is ordinarily that of a liquid or solid.

Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly. [Obs.]

A circular frame turning about an axis; a rotating disk, whether solid, or a frame composed of an outer rim, spokes or radii, and a central hub or nave, in which is inserted the axle, -- used for supporting and conveying vehicles, in machinery, and for various purposes; as, the wheel of a wagon, of a locomotive, of a m…