tropic

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

of weather or climate; hot and humid as in the tropics

either of two parallels of latitude about 23.5 degrees to the north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics

One of the two small circles of the celestial sphere, situated on each side of the equator, at a distance of 23° 28&min;, and parallel to it, which the sun just reaches at its greatest declination north or south, and from which it turns again toward the equator, the northern circle being called the Tropic of Cancer, and the southern the Tropic of Capricorn, from the names of the two signs at which they touch the ecliptic.