psit·ta·co·sis 
(sĭt′ə-kōsĭs)
(sĭt′ə-kōsĭs)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 ornithosis, parrot fever.
[New Latin psittacōsis : Latin psittacus, parrot (from Greek psittakos) + -OSIS.]
psit′ta·cotic (-kŏtĭk, -kōtĭk) adj.