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thermal

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The definition of thermal is something related to heat.

(adjective)

Long underwear is an example of something that would be described as thermal underwear.

See thermal in Webster's New World College Dictionary

adjective

having to do with heat, hot springs, etc.
warm or hot
☆ designating or of a loosely knitted material honeycombed with air spaces for insulation to help retain body heat: thermal underwear

Origin: Fr < Gr thermē, heat: see warm

noun

a rising column of warm air, caused by the uneven heating of the earth or sea by the sun

Related Forms:

thermally adverb

See thermal in American Heritage Dictionary 4

adjective

Of, relating to, using, producing, or caused by heat.
Intended or designed in such a way as to help retain body heat: thermal underwear.

noun

A rising current of warm air.

Related Forms:

therˈmal·ly adverb

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