Definitions from Wiktionary (Tropic)

▸ noun:  (geography) Either of the two parallels of latitude 23°26′ north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics.
▸ adjective:  Of, or relating to the tropics; tropical.
▸ adjective:  (meteorology, rare) Hot and humid.
▸ adjective:  (biochemistry, not comparable) Having the quality of indirectly inducing a biological or chemical change in a system or substrate.
▸ adjective:  Pertaining to, involving, or of the nature of a trope or tropes.
▸ noun:  Alternative form of tropic (one of two specific lines of latitude that divide the Northern and Southern hemispheres, respectively; the Tropic of Cancer and the Tropic of Capricorn). [(geography) Either of the two parallels of latitude 23°26′ north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics.]

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