Pneu*mat"ic (?), Pneu*mat"ic*al (?), a. [L. pneumaticus, Gr. &?;, fr. &?;, &?;, wind, air, &?; to blow, breathe; cf. OHG. fnehan: cf. F. pneumatique. Cf. Pneumonia.]


Consisting of, or resembling, air; having the properties of an elastic fluid; gaseous; opposed to dense or solid.

The pneumatical substance being, in some bodies, the native spirit of the body.


Of or pertaining to air, or to elastic fluids or their properties; pertaining to pneumatics; as, pneumatic experiments. "Pneumatical discoveries." Stewart.


Moved or worked by pressure or flow of air; as, a pneumatic instrument; a pneumatic engine.

4. (Biol.)

Fitted to contain air; Having cavities filled with air; as, pneumatic cells; pneumatic bones.

Pneumatic action, or Pneumatic lever (Mus.), a contrivance for overcoming the resistance of the keys and other movable parts in an organ, by causing compressed air from the wind chest to move them. --
Pneumatic dispatch, a system of tubes, leading to various points, through which letters, packages, etc., are sent, by the flow and pressure of air. --
Pneumatic elevator, a hoisting machine worked by compressed air. --
Pneumatic pile, a tubular pile or cylinder of large diameter sunk by atmospheric pressure. --
Pneumatic pump, an air-exhausting or forcing pump. --
Pneumatic railway. See Atmospheric railway, under Atmospheric. --
Pneumatic syringe, a stout tube closed at one end, and provided with a piston, for showing that the heat produced by compressing a gas will ignite substances. --
Pneumatic trough, a trough, generally made of wood or sheet metal, having a perforated shelf, and used, when filled with water or mercury, for collecting gases in chemical operations. --
Pneumatic tube. See Pneumatic dispatch, above.


© Webster 1913

Pneu*mat"ic (?), n.

A vehicle, as a bicycle, the wheels of which are fitted with pneumatic tires.


© Webster 1913

Pneu*mat"ic, Pneu*mat"ic*al , a.

Adapted for containing compressed air; inflated with air; as, a pneumatic cushion; a pneumatic tire, a tire formed of an annular tube of flexible fabric, as India rubber, suitable for being inflated with air.


© Webster 1913

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