either of the two parallels of terrestrial latitude at a distance of about 23½ 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 compare tropic of cancer, tropic of capricorn
tropics or Tropics plural : 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
of a hormone : 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)
either of the two parallels of the earth's latitude that are approximately 23½ degrees north of the equator and approximately 23½ degrees south of the equator
plural often capitalized : the region lying between the two tropics
tropical