Pneu*mat"ics (?), n. [Cf. F. pneumatique.]
1.
That branch of science which treats of the mechanical properties of air and other elastic fluids, as of their weight, pressure, elasticity, etc. See Mechanics.
2. Philos. & Theol.
The scientific study or knowledge of spiritual beings and their relations to God, angels, and men.
© Webster 1913.