Definition of cuckoo noun from the Oxford Advanced Learner's Dictionary

 

cuckoo

 noun
noun
BrE BrE//ˈkʊkuː//
 
; NAmE NAmE//ˈkʊkuː//
 
Birds
 
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(pl. cuckoos) a bird with a call that sounds like its name. Cuckoos leave their eggs in the nests of other birds. see also cloud cuckoo land See related entries: Birds Word Origin Middle English: from Old French cucu, imitative of its call.
See the Oxford Advanced American Dictionary entry: cuckoo