Etymology
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pneumatic (adj.)

"moved or played by means of air; of or pertaining to air or gases," 1650s, from Latin pneumaticus "of the wind, belonging to the air," from Greek pneumatikos "of wind or air" (which is attested mainly as "of spirit, spiritual"), from pneuma (genitive pneumatos) "the wind," also "breath" (see pneuma). Earlier was pneumatical (c. 1600). The pneumatic-dispatch tube was so called by 1859 (in Paris, pneumatique).

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Definitions of pneumatic

pneumatic (adj.)
of or relating to or using air (or a similar gas);
pneumatic drill
pneumatic tire
From wordnet.princeton.edu