The Collaborative International Dictionary of English v.0.48:

Curassow \Cu*ras"sow\ (k?-r?s"s?), n. [Native name in Brazil.]
   (Zool.)
   A large gallinaceous bird of the American genera Crax,
   Ourax, etc., of the family Cracid[ae].
   [1913 Webster]

   Note: The crested curassow (Crax alector) is black, and
         about the size of a small hen-turkey, with an erectile
         crest of curled feathers. It ranges from Mexico to
         Brazil. The galeated curassow or cushew bird (Ourax
         Pauxi) is similar in size, and has a large, hollow,
         blue, pear-shaped protuberance on the head.
         [1913 Webster]

WordNet (r) 3.0 (2006):

curassow
    n 1: large crested arboreal game bird of warm parts of the
         Americas having long legs and tails; highly esteemed as
         game and food