GNU Collaborative International Dictionary of English

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1.       
   Cockatoo (kŏkˌȧ‑to͞oˈ), n. [Malayan kakatūa.] (Zool.) A bird of the Parrot family, of the subfamily Cacatuinæ, 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]