1.nounA member of the class of animals Aves in the phylum Chordata, characterized by being warm-blooded, having feathers and wings usually capable of flight, and laying eggs.
"Ducks and sparrows are birds."
2.nounA man, fellow.
3.nounA girl or woman, especially one considered sexually attractive.
4.nounGirlfriend.
"Mike went out with his bird last night."
5.nounAn airplane.
6.nounA satellite.
7.nounA chicken; the young of a fowl; a young eaglet; a nestling.