Etymology
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cockatoo (n.)

name given to various birds of the parrot family, 1610s, from Dutch kaketoe, from Malay (Austronesian) kakatua, possibly echoic, or from kakak "elder brother or sister" + tua "old." Also cockatiel, cockateel (1863), from Dutch diminutive kaketielje (1850), which is perhaps influenced by Portuguese. Spelling influenced by cock (n.1).

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Definitions of cockatoo

cockatoo (n.)
white or light-colored crested parrot of the Australian region; often kept as cage birds;
From wordnet.princeton.edu