noun Pathology.
a rickettsial disease affecting birds of the parrot family, pigeons, and domestic fowl, caused by the chlamydia Chlamydia psittaci and transmissible to humans.
Also called ornithosis, parrot fever.

1895–1900; < Latin psittac(us) parrot (< Greek psittakós) + -osis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psittacosis (ˌsɪtəˈkəʊsɪs)
parrot fever, Also called: ornithosis a disease of parrots, caused by the obligate intracellular parasite Chlamydia psittaci, that can be transmitted to man, in whom it produces inflammation of the lungs and pneumonia
[C19: from New Latin, from Latin psittacus a parrot, from Greek psittakos; see -osis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

psittacosis psit·ta·co·sis (sĭt'ə-kō'sĭs)
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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