The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   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.
          [1913 Webster]

                The brilliant flowers of the tropics bloom from
                the windows of the greenhouse and the saloon.
                                                  --Bancroft.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tropic \Trop"ic\, a.
   Of or pertaining to the tropics; tropical.
   [1913 Webster]

   Tropic bird (Zool.), any one of three species of oceanic
      belonging to the genus Phaethon, found chiefly in
      tropical seas. They are mostly white, and have two central
      tail feathers very long and slender. The yellow-billed
      tropic bird. Phaethon flavirostris (called also
      boatswain), is found on the Atlantic coast of America,
      and is common at the Bermudas, where it breeds.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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,
           tropic]
    2: of weather or climate; hot and humid as in the tropics;
       "tropical weather" [syn: tropical, tropic]
    n 1: either of two parallels of latitude about 23.5 degrees to
         the 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

U.S. Gazetteer Places (2000):

Tropic, UT -- U.S. town in Utah
   Population (2000):    508
   Housing Units (2000): 206
   Land area (2000):     8.380698 sq. miles (21.705908 sq. km)
   Water area (2000):    0.021682 sq. miles (0.056155 sq. km)
   Total area (2000):    8.402380 sq. miles (21.762063 sq. km)
   FIPS code:            77560
   Located within:       Utah (UT), FIPS 49
   Location:             37.623489 N, 112.088526 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Tropic, UT
    Tropic