Medical Definition of psittacosis
plural psittacoses \-ˌsēz\play
: an infectious disease of birds that is caused by a bacterium (Chlamydia psittaci synonym Chlamydophila psittaci), is marked by diarrhea and wasting, and is transmissible to humans in whom it usually occurs as an atypical pneumonia accompanied by high fever—called also ; compare ornithosis
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