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.