Dictionary.com
Thesaurus.com

thermomotor

American  
[thur-muh-moh-ter] / ˌθɜr məˈmoʊ tər /

noun

  1. a heat engine.


thermomotor British  
/ ˌθɜːməʊˈməʊtə /

noun

  1. an engine that produces force from the expansion of a heated fluid

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of thermomotor

thermo- + motor