Source : Webster's Revised Unabridged Dictionary (1913)

Tropic \Trop"ic\, a.
   Of or pertaining to the tropics; tropical.

   {Tropic bird} (Zo["o]l.), any one of three species of oceanic
      belonging to the genus {Pha["e]thon}, found chiefly in
      tropical seas. They are mostly white, and have two central
      tail feathers very long and slender. The yellow-billed
      tropic bird. {Pha["e]thon flavirostris} (called also
      {boatswain}), is found on the Atlantic coast of America,
      and is common at the Bermudas, where it breeds.

Tropic \Trop"ic\, a. [Atropine + -ic.] (Chem.)
   Of, pertaining to, or designating, an acid obtained from
   atropine and certain other alkaloids, as a white crystalline
   substance slightly soluble in water.

Tropic \Trop"ic\, n. [F. tropique, L. tropicus of or belonging
   to a turn, i. e., of the sun, Gr. ? of the solstice, ? (sc.
   ?) the tropic or solstice, fr. ? to turn. See {Trope}.]
   1. (Astron.) One of the two small circles of the celestial
      sphere, situated on each side of the equator, at a
      distance of 23[deg] 28[min], and parallel to it, which the
      sun just reaches at its greatest declination north or
      south, and from which it turns again toward the equator,
      the northern circle being called the {Tropic of Cancer},
      and the southern the {Tropic of Capricorn}, from the names
      of the two signs at which they touch the ecliptic.

   2. (Geog.)
      (a) One of the two parallels of terrestrial latitude
          corresponding to the celestial tropics, and called by
          the same names.
      (b) pl. The region lying between these parallels of
          latitude, or near them on either side.

                The brilliant flowers of the tropics bloom from
                the windows of the greenhouse and the saloon.
                                                  --Bancroft.

Source : WordNet®

tropic
     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: {tropical}]
     2: of weather or climate; hot and humid as in the tropics;
        "tropical weather" [syn: {tropical}]

tropic
     n : either of two parallels of latitude about 23.5 degrees 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