Thermal - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

ther·mal

Audio Help [thur-muh

l] Pronunciation Key

–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- + -al¹

]

—Related forms

ther·mal·ly, adverb

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Encyclopædia Britannica, Inc.
Thermal

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American Heritage Dictionary - Cite This Source - Share This

ther·mal Audio Help (thûr'məl) Pronunciation Key
adj.

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

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
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.

WordNet - Cite This Source - Share This

thermal
adjective
1.	relating to or associated with heat; "thermal movements of molecules"; "thermal capacity"; "thermic energy"; "the caloric effect of sunlight" [ant: nonthermal]
2.	of or relating to a hot spring; "thermal water"
3.	caused by or designed to retain heat; "a thermal burn"; "thermal underwear"
noun
1.	rising current of warm air

Kernerman English Multilingual Dictionary - Cite This Source - Share This
thermal [əθəːməl] adjective

of heat
Example: thermal springs (= natural springs of warm or hot water); thermal units

Arabic:	حَراري
Chinese (Simplified):	热的
Chinese (Traditional):	熱的
Czech:	termální, tepelný
Danish:	termisk
Dutch:	thermisch
Estonian:	soojus-, kuumavee-
Finnish:	kuuma, lämpö-
French:	thermal; thermique
German:	Thermal-…, Heiz-…
Greek:	θερμικός
Hungarian:	termál
Icelandic:	(jarð-)hita-, *varma-
Indonesian:	panas
Italian:	termale, termico

Japanese:	熱の
Korean:	열의
Latvian:	termisks; karsts; siltuma-
Lithuanian:	šiluminis, šilumos, karštas
Norwegian:	varme-, varm, termo-
Polish:	cieplny
Portuguese (Brazil):	termal, térmico
Portuguese (Portugal):	termal
Romanian:	termal; termic
Russian:	термальный
Slovak:	termálny, tepelný, horúci
Slovenian:	termalen; toploten
Spanish:	termal; térmico
Swedish:	termisk, varm, värme-
Turkish:	termik, ısıyla ilgili

The American Heritage Science Dictionary - Cite This Source - Share This

thermal Audio Help   (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.