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external-combustion

[ik-stur-nl-kuh m-buhs-chuh n] /ɪkˈstɜr nl kəmˈbʌs tʃən/
adjective
1.
noting or pertaining to an engine, as a steam engine, in which fuel ignition takes place outside the cylinder, turbine, or the like, in which heat energy is transformed into mechanical force.
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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