thermal
adjective/ˈθɜːml/
/ˈθɜːrml/
[only before noun]- (specialist) connected with heat
- thermal energy
- (of clothing) designed to keep you warm by preventing heat from escaping from the body
- thermal underwear
- (of streams, lakes, etc.) in which the water has been naturally heated by the earth
- thermal springs
Word Originmid 18th cent. (in the sense ‘relating to hot springs’): from French, from Greek thermē ‘heat’.
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thermal