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Definition of thermal noun from the Oxford Advanced American Dictionary

     

    thermal

     noun
    noun
    NAmE//ˈθərml//
     
     
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  1. 1[countable] a rising current of warm air used, for example, by a glider to gain height
  2. 2thermals [plural] warm underwear that prevents heat from escaping from the body
See thermal in the Oxford Advanced Learner's Dictionary
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