tropic Definition

either of the two parallels of terrestrial latitude at a distance of about 231/2 degrees north or south of the equator where the sun is directly overhead when it reaches its most northerly or southerly point in the sky

the region lying between the tropics

of, relating to, or occurring in the tropics

of, relating to, or characteristic of tropism or of a tropism

influencing the activity of a specified gland

turning, changing, or tending to turn or change in a (specified) manner or in response to a (specified) stimulus

attracted to or acting upon (something specified)

any of a genus (Phaethon of the family Phaethontidae) of web-footed birds that are related to the pelicans, are found chiefly in tropical seas often far from land, and have mostly white satiny plumage marked with a little black, a greatly elongated central pair of tail feathers, and a brightly colored bill

the parallel of latitude that is approximately 231/2 degrees north of the equator and that is the northernmost latitude reached by the overhead sun

the parallel of latitude that is approximately 231/2 degrees south of the equator and that is the southernmost latitude reached by the overhead sun