adj. & n.
--adj.
1. of or relating to air or wind.
2 containing or operated by compressed air.
3 connected with or containing air cavities esp. in the bones of birds or in fish.
Phrases and idioms:
pneumatic drill a drill driven by compressed air, for breaking up a hard surface. pneumatic trough a shallow container used in laboratories to collect gases in jars over the surface of water or mercury.
Derivatives:
pneumatically adv. pneumaticity n.
Etymology: F pneumatique or L pneumaticus f. Gk pneumatikos f. pneuma wind f. pneo breathe