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external-combustion

[ ik-stur-nl-kuhm-buhs-chuhn ]
/ ɪkˈstɜr nl kəmˈbʌs tʃən /
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adjective
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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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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