- Geography.
- either of two corresponding parallels of latitude on the terrestrial globe, one (tropic of Cancer ) about 23½° N, and the other (tropic of Capricorn ) about 23½° S of the equator, being the boundaries of the Torrid Zone.
- the regions lying between and near these parallels of latitude; the Torrid Zone and neighboring regions.
- either of two circles on the celestial sphere, one lying in the same plane as the tropic of Cancer, the other in the same plane as the tropic of Capricorn.
- of, pertaining to, characteristic of, or occurring in the tropics; tropical: romance under the tropic skies of Old Mexico.
- a combining form with the meanings “turned toward, with an orientation toward” that specified by the initial element (geotropic), “having an affinity for, affecting” what is specified (lipotropic; neurotropic; psychotropic), “affecting the activity of, maintaining” a specified organ (gonadotropic).
- either of the parallel lines of latitude at about 23 1/2 °N (tropic of Cancer) and 23 1/2 °S (tropic of Capricorn) of the equator
- that part of the earth's surface between the tropics of Cancer and Capricorn; the Torrid Zone
- either of the two parallel circles on the celestial sphere having the same latitudes and names as the corresponding lines on the earth
- a less common word for tropical
- turning or developing in response to a certain stimulus
