An engine driven by the production, expansion, or combustion of gas; (later esp.) an internal combustion engine which uses gas as fuel. Cf. gas motor…

‘an early name for the gas-engine, in which the piston is moved by the expansion due to the sudden combustion of a body of gas in the cylinder’…

A turbine driven by a flow of gas; (subsequently) esp. one driven by expanding hot gases produced in the combustion of fuel, and used to power an…