Pneü-māt'ic or Pneü-māt'ic-al, a.

(nū-), a. [Lat. pneumaticus, Gr. πνευματικός, from πνεῦμα, wind, air, from πνεῖν, to blow, breathe; Fr. pneumatique, It. pneumatico, Sp. pneumatico, nem. pneumatico.] 1. Consisting of, or resembling, air; — opposed to dense or solid. The pneumatic substance being, in some bodies, the native spirit of the body. Bacon.

2. Pertaining to air, or to elastic fluids or their properties; pertaining to pneumatics; as, pneumatic experiments; a pneumatic engine.
3. Moved or played by means of air; as, a pneumatic instrument of music.
4. Adapted to, or used for, experiments with gases; as, a pneumatic cistern. Francis.
5. Fitted to contain air; as, pneumatic cells.

Pneumatic pile, a tubular pile or cylinder of large diameter sunk by atmospheric pressure.