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Definition of thermal noun from the Oxford Advanced Learner's Dictionary

thermal

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