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. 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. pneumatically adv. pneumaticity n.
[ F pneumatique or L pneumaticus f. Gk pneumatikos f. pneuma wind f. pneo breathe ]