American Heritage® Dictionary of the English Language, Fourth Edition
- n. An engine operated by heat, especially by the expansion of heated air.
Century Dictionary and Cyclopedia
- n. A heat-engine, particularly a so-called caloric engine, or an air-engine driven by the expansive force of heated air. Compare gas-engine, heat-engine, and caloric engine (under caloric).
GNU Webster's 1913
- n. A heat engine; a hot-air engine.
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