Pronunciation: (klu-mid'ē-u),[key] —n., —pl.-myd•i•aePronunciation: (-mid'ē-ē").[key] 1. Microbiol.any coccoid rickettsia of the genus Chlamydia, parasitic in birds and mammals, including humans, and causing various infections, esp. of the eyes, as trachoma, lungs, as psittacosis, and genitourinary tract, as urethritis or chlamydia.
2. Pathol.Also called lymphogranuloma venereum. a widespread, often asymptomatic sexually transmitted disease caused by Chlamydiatrachomatis, a major cause of nongonococcal urethritis in men and pelvic inflammatory disease and ectopic pregnancy in women.