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



    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 Originmid 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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