a combining form meaning “heat,” “hot,” used in the formation of compound words: thermoplastic.
Also, therm-, -therm.

< Greek, combining form of thermós hot, thérmē heat Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thermo- or (before a vowel) therm-
combining form
related to, caused by, or measuring heat: thermodynamics; thermophile
[from Greek thermos hot, thermē heat]
therm- or (before a vowel) therm-
combining form
[from Greek thermos hot, thermē heat]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

comb. form meaning "hot, heat," used in scientific and technical words, from Gk. thermos "hot," therme "heat" (see thermal).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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Example sentences for thermo
Physiological thermo regulation in heat stressed birds consequences of body size.
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