Pan troglodytes, a species of great ape in the genus Pan, native to Africa, and believed by biologists to be the closest extant relative to humans along with the bonobo.
A member of the genus Pan, including the bonobo which is also known as the pygmy chimpanzee.
Any of various birds, of the family Cuculidae, famous for laying its eggs in the nests of other species; but especially a common cuckoo (Cuculus canorus), that has a characteristic two-note call.
The cuckoo clock itself.
The sound of that particular bird.
A person who inveigles themselves into a place where they should not be (used especially in the phrase a cuckoo in the nest).
Someone who is crazy.
The bird-shaped figure found in cuckoo clocks.
To make the call of a cuckoo.
To repeat something incessantly.
Crazy; not sane.