pneumatIc, pneumatical

& s. [Lat. pneumatic us, from Gr. pneumatikos =pertaining to air or breath; pneuma (gen it. pneumatos )=wind, air; Fr. pneumatique; Ital. & Sp. pneumatico.] A. As adjective : 1. Consisting of or resembling air; having the properties or qualities of an elastic fluid; gaseous. "All solid bodies consist of parts pneumatical and tangible."- Bacon . 2. Of or pertaining to air or elastic fluids, or to their properties. "The pneumatical discoveries of modern chemistry." Stewart : Outlines of Moral Philosophy , § 272. 3. Filled with or containing air. "Most of the bones were pneumatic -that is to say, were hollow and filled with air."-Nicholson: Palcon tology (1879), ii. 224. 4. Moved or played by air or wind. B. As subst.: A vaporous substance; a gas. pneumatic-action, s.