English

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

     

    thermal

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

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