English

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

     

    thermal

     adjective
    adjective
    BrE BrE//ˈθɜːml//
     
    ; NAmE NAmE//ˈθɜːrml//
     
    [only before noun]
     
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  1. 1(specialist) connected with heat thermal energy
  2. 2(of clothing) designed to keep you warm by preventing heat from escaping from the body thermal underwear
  3. 3(of streams, lakes, etc.) in which the water has been naturally heated by the earth thermal springs
  4. 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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