Definition of cuckoo noun from the Oxford Advanced American Dictionary

 

cuckoo

 noun
noun
NAmE//ˈkuku//
 
, NAmE//ˈkʊku//
 
(pl. cuckoos)
 
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a bird with a call that sounds like its name. Cuckoos leave their eggs in the nests of other birds.
See the Oxford Advanced Learner's Dictionary entry: cuckoo