Air engine
noun
an engine that uses the expansion of heated air to drive a piston
a small engine that uses compressed air to drive a piston
historical examples
the air engine would in many respects possess advantages over the steam engine, if it could be worked economically.
great facts frederick c. bakewell
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an express service for shipping small packages of goods by air: includes ground pickup at origin and delivery at destination. the goods shipped by this service. to send or transport by air express: your package will be air-expressed and should reach its destination tomorrow. pertaining to, using, or sent by air express: your air-express package […]
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noun another name for air cleaner