pneumatics Meaning, Definition & Usage

  1. noun the branch of mechanics that deals with the mechanical properties of gases

WordNet

Pneu*mat"ics noun
Etymology
Cf. F. pneumatique.
Definitions
  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