Definition of tropic noun from the Oxford Advanced American Dictionary

     

    tropic

     noun
    noun
    NAmE//ˈtrɑpɪk//
     
     
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  1. 1[countable, usually singular] one of the two imaginary lines drawn around the world 23° 26′ north (the Tropic of Cancer) or south (the Tropic of Capricorn) of the equator
  2. 2the tropics [plural] the area between the two tropics, which is the hottest part of the world synonym the torrid zone
See the Oxford Advanced Learner's Dictionary entry: tropic