a greyish brown European bird that lays its eggs in the nests of other birds
a greyish brown European bird that lays its eggs in the nests of small songbirds, which hatch them and rear the offspring: Cuculus canorus
any of a large family of related birds: family Cuculidae
the characteristic two-note call of the male cuckoo
[Middle English cuccu from Old French cucu, imitative of the bird's call]