thermal

The definition of thermal is something related to heat.

(adjective)

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

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See thermal in Webster's New World College Dictionary

adjective

  1. having to do with heat, hot springs, etc.
  2. warm or hot
  3. ☆ 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:

See thermal in American Heritage Dictionary 4

adjective
  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.
noun
A rising current of warm air.

Related Forms:

  • therˈmal·ly adverb

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