The American Heritage® Dictionary of the English Language, 4th Edition
n. An infectious disease of parrots and related birds caused by the bacterium Chlamydia psittaci, that is communicable to humans, in whom it produces high fever, severe headache, and symptoms similar to pneumonia. Also called parrot fever.
n. An infection by Chlamydia bacteria, caught from infected birds, and characterised by fever, pneumonia and headaches.
The Century Dictionary and Cyclopedia
n. An infectious influenza-like disease of parrots, which may be transmitted to man in the form of disease of the lungs.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. infectious disease of birds
n. an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds
Word Usage
"Birds, especially parrots, can give people a disease called psittacosis, sometimes also referred to as parrot fever, which is caused by bacteria in the droppings, on the feathers, and in the nasal secretions of infected birds."