thermal
noun/ˈθɜːml/
/ˈθɜːrml/
- [countable] a rising current of warm air used, for example, by a glider to gain height
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- thermals[plural] (especially British English) warm underwear that prevents heat from escaping from the bodyTopics Clothes and Fashionc2
Word Originmid 18th cent. (in the sense ‘relating to hot springs’): from French, from Greek thermē ‘heat’.
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