PNEUMATIC PNEUMATICAL, adjective numat'ic. [Gr. breath, spirit; to breathe or blow.] 1. Consisting of air, as a thin compressible substance; opposed to dense or solid substances. The pneumatic substance being, in some bodies, the native spirit of the body. 2. Pertaining to air, or to the philosophy of its properties; as pneumatic experiments; a pneumatic engine. 3. Moved or played by means of air; as a pneumatic instrument of music.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI