- a combining form meaning “heat,” “hot,” used in the formation of compound words: thermoplastic.
Origin of thermo-
< Greek, combining form of thermós hot, thérmē heat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
before a vowel therm-
- related to, caused by, or measuring heatthermodynamics; thermophile
from Greek thermos hot, thermē heat
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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- A prefix that means heat, as in thermometer.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.