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thermal

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ther⋅mal

  [thur-muhl]
Use thermal in a Sentence
–adjective
1. Also, thermic. of, pertaining to, or caused by heat or temperature: thermal capacity.
2. of, pertaining to, or of the nature of thermae: thermal waters.
3. designed to aid in or promote the retention of body heat: a thermal blanket.
–noun
4. Meteorology. a rising air current caused by heating from the underlying surface, esp. such a current when not producing a cloud.
5. thermals. thermal underwear.
Origin:
1750–60; therm- + -al 1

Related forms:
ther⋅mal⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ther·mal   (thûr'məl)   
adj.  

  1. Of, relating to, using, producing, or caused by heat.

  2. Intended or designed in such a way as to help retain body heat: thermal underwear.

n.  A rising current of warm air.
ther'mal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

thermal  (adj.)
1756, "having to do with hot springs," from Fr. thermal (Buffon), from Gk. therme "heat," from PIE *ghwerm-/*ghworm- "warm" (cf. L. fornax "an oven, kiln," formus "warm," O.E. wearm; see warm). Sense of "having to do with heat" is first recorded 1837. The noun meaning "rising current of relatively warm air" is recorded from 1933.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: ther·mal
Pronunciation: 'th&r-m&l
Function: adjective
1 : of, relating to, or caused by heat thermal senses>
2 : being or involving a state of matter dependent upon temperature <thermal agitation of molecular structure> —ther·mal·ly /-m&-lE/ adverb
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

thermal ther·mal (thûr'məl)
adj.

  1. Of, relating to, using, producing, or caused by heat.

  2. Intended or designed in such a way as to help retain body heat.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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