Cockatoo \Cock`a*too"\ (k[o^]k`[.a]*t[=oo]"), n. [Malayan
   kakat[=u]a.] (Zool.)
   A bird of the Parrot family, of the subfamily {Cacatuinae},
   having a short, strong, and much curved beak, and the head
   ornamented with a crest, which can be raised or depressed at
   will. There are several genera and many species; as the
   {broad-crested cockatoo} ({Plictolophus cristatus} or
   {Cacatua cristatus}), the sulphur-crested ({Cacatua galerita}
   or {Plictolophus galeritus}), etc. The {palm cockatoo} or
   {great black cockatoo} of Australia is {Probosciger  aterrimus} (formerly {Microglossus aterrimus}).
   [1913 Webster +PJC]