Source : Webster's Revised Unabridged Dictionary (1913)

Tropical \Trop"ic*al\, a. [Cf. L. tropicus of turning, Gr. ?.
   See {Tropic}, n.]
   1. Of or pertaining to the tropics; characteristic of, or
      incident to, the tropics; being within the tropics; as,
      tropical climate; tropical latitudes; tropical heat;
      tropical diseases.

   2. [From {Trope}.] Rhetorically changed from its exact
      original sense; being of the nature of a trope;
      figurative; metaphorical. --Jer. Taylor.

            The foundation of all parables is some analogy or
            similitude between the tropical or allusive part of
            the parable and the thing intended by it. --South.

   {Tropic month}. See {Lunar month}, under {Month}.

   {Tropic year}, the solar year; the period occupied by the sun
      in passing from one tropic or one equinox to the same
      again, having a mean length of 365 days, 5 hours, 48
      minutes, 46.0 seconds, which is 20 minutes, 23.3 seconds
      shorter than the sidereal year, on account of the
      precession of the equinoxes.

Source : WordNet®

tropical
     adj 1: relating to or situated in or characteristic of the tropics
            (the region on either side of the equator); "tropical
            islands"; "tropical fruit" [syn: {tropic}]
     2: of or relating to the tropics, or either tropic; "tropical
        year"
     3: characterized by or of the nature of a trope or tropes;
        changed from its literal sense
     4: of weather or climate; hot and humid as in the tropics;
        "tropical weather" [syn: {tropic}]