May 5, 2026 pneumatic nu̇-ˈma-tik 3 syllables rare ‹ adjective.of, relating to, or using gas (such as air or wind): adjective.moved or worked by air pressure adjective.adapted for holding or inflated with compressed air › Origin Latin pneumaticus, from Greek pneumatikos, from pneumat-, pneuma air, breath, spirit, from pnein to breathe.