Chlamydia psittaci

[sĭtə-sī′]
n.
  1. A species of Chlamydia that causes psittacosis in humans and ornithosis, pneumonitis, abortion, encephalomyelitis, and enteritis in various animals.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.