relating to. situated in. or characteristic of the tropics (the region on either side of the equator).

Merriam-Webster Online Dictionary
tropical (adjective)
a) of, relating to, occurring in, or suitable for use in the - tropics tropical forests a tropical disease
b) of, being, or characteristic of a region or climate that is frost-free with temperatures high enough to support year-round plant growth given sufficient moisture - tropical Florida
Latin from Greek from trope - figurative
tropical (Wikipedia)
World map with the intertropical zone highlighted in crimson
Tropical climate zones of the Earth where all twelve months have mean temperatures above 18.0 °C (64.4 °F)

The tropics are a region of the Earth surrounding the equator. They are delimited in latitude by the Tropic of Cancer in the Northern Hemisphere at 23°26′13.5″ (or 23.43708°) N and the Tropic of Capricorn in the Southern Hemisphere at 23°26′13.5″ (or 23.43708°) S; these latitudes correspond to the axial tilt of the Earth. The tropics are also referred to as the tropical zone and the torrid zone (see geographical zone). The tropics include all the areas on the Earth where the Sun is at a point directly overhead at least once during the solar year (which is a subsolar point).

The tropics are distinguished from the other climatic and biomatic regions of Earth, which are the middle latitudes and the polar regions on either side of the equatorial zone.

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