Cock′a‐too″ (kŏk′ȧ‐to͞o″), n. [Malayan kakatūa.] (Zoöl.) 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 (Plictolophus, orCacatua, cristatus), the sulphur-crested (P. galeritus), etc. The palm or great black cockatoo of Australia is Microglossus aterrimus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.