1. (n.) That branch of zoology which treats of the natural history of birds and their classification.

2. (n.) A treatise or book on this science.

anatomy animal physiology anthropology biology comparative anatomy conchology ecology entomology ethology helminthology herpetology ichthyology malacology mammalogy protozoology taxidermy taxonomy zoogeography zoography zoology zoonomy zoopathology zoophysics zootaxy zootomy