[1] : 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
see also:
tropic bird phaethon phaethon flavirostris boatswain 

[2] : WordNet (r) 2.0

tropic bird
     n : mostly white web-footed tropical seabird often found far
         from land syn: tropicbird, boatswain bird
see also:
tropicbird boatswain bird 

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