tropic - definition and synonyms

noun 

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/ˈtrɒpɪk/
singulartropic
pluraltropics
  1. 1
    [countable] one of the two imaginary lines around the Earth on either side of the equator. The Tropic of Cancer is 23° 26’ north of it and the Tropic of Capricorn is 23° 26’ south of it.
  2. 2

    the tropics

    [plural] the hottest part of the Earth, between the Tropic of Cancer and the Tropic of Capricorn