The definition of pneumatic is something that contains or uses gases such as air to create a mechanical response.(adjective)
A drill that uses air to work is an example of a drill that would be described as a pneumatic drill.
See pneumatic in Webster's New World College Dictionary
Origin: L pneumaticus < Gr pneumatikos < pneuma, breath: see pneuma
See pneumatic in American Heritage Dictionary 4
Origin: French pneumatique
Origin: , from Latin pneumaticus
Origin: , from Greek pneumatikos
Origin: , from pneuma, pneumat-, wind; see pneu- in Indo-European roots.
Learn more about pneumatic