/sit'euh koh"sis/ , n. Pathol.
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; psittac ( us ) parrot ( psittakós ) + -OSIS ]