Akademik

an internal-combustion engine similar to a gasoline engine but using natural gas instead of gasoline vapor

: an internal-combustion engine similar to a gasoline engine but using natural or manufactured gas instead of gasoline vapor; broadly : internal-combustion engine

an internal-combustion engine driven by a mixture of air and gas.

[1870-75]

gas engine noun

An engine worked by the explosion of gas

Main Entry: ↑gas

gas engine,

1. an internal-combustion engine run by illuminating gas, natural gas, or other gas supplied from an outside source or tank.

2. U.S. any internal-combustion engine.