The Collaborative International Dictionary
Nymphicus hollandicus
cockatiel \cock"a*tiel\, Cockateel \Cock"a*teel\, n. (Zo["o]l.) A small gray and white Australian parrot ( Leptolophus hollandicus, formerly Calopsitta Nov[ae]-Hollandi[ae]) with a prominent crest; the male has bright yellow cheeks and crest, but the female has only a pale yellow in the face; -- it is so called from its note.
Syn: cockateel, cockatoo parrot, Nymphicus hollandicus.