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a combining form meaning “heat,” “hot,” used in the formation of compound words:
Also, therm-, -therm.
Origin of thermo-
< Greek, combining form of thermós hot, thérmē heat Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for thermo-


combining form
related to, caused by, or measuring heat: thermodynamics, thermophile
Word Origin
from Greek thermos hot, thermē heat
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
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Word Origin and History for thermo-

word-forming element meaning "hot, heat," used in scientific and technical words, from comb. form of Greek thermos "hot," therme "heat" (see thermal).

Online Etymology Dictionary, © 2010 Douglas Harper
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thermo- in Medicine

thermo- or therm-
Heat: thermogenesis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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thermo- in Science
thermo- or therm-  
A prefix that means "heat," as in thermometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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