Cockatoo \Cock`a*too\, n. [Malayan kakat[=u]a.]

(Zo["o]l.) A bird of the Parrot family, of the subfamily Cacatuin[ae], 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 (Plictolophus, or Cacatua, cristatus), the sulphur-crested (P. galeritus), etc. The palm or great black cockatoo of Australia is Microglossus aterrimus.

Source: Webster's Revised Unabridged Dictionary (1913)