American English

Definition of thermal adjective from the Oxford Advanced American Dictionary

     

    thermal

     adjective
    adjective
    NAmE//ˈθərml//
     
    [only before noun]
     
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  1. 1(technology) 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. NAmE//ˈθərməli//
     
    adverb
See the Oxford Advanced Learner's Dictionary entry: thermal