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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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Brentwood Heating/Air
Installation, repair, maintenance! Free Estimate, one-888-530-6565
www.ata-ac.com
Special off season prices
$1,500 off complete A/C system Call Now (866) 620-0409
www.theairpros.com
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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Science Dictionary
thermal   (thûr'məl)  Pronunciation Key 
Adjective   Relating to heat.

Noun   A usually columnar mass of warm air that rises in the lower atmosphere because it is less dense than the air around it. Thermals form because the ground surface is heated unevenly by the Sun. The air usually rises until it is in equilibrium with the air surrounding it.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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