noun Any of various birds, of the family Cuculidae within the order Cuculiformes, 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.
noun The sound of that particular bird.
noun The bird-shaped figure found in cuckoo clocks.
noun The cuckoo clock itself.
noun A person who inveigles themselves into a place where they should not be (used especially in the phrase a cuckoo in the nest).
noun Someone who is crazy.
noun Alternative form of coo-coo (Barbadian food).