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
Either of the two parallels of latitude 23°27′ 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.
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).
Of, or relating to the tropics; tropical.