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Microbiology. any coccoid rickettsia of the genus Chlamydia, parasitic in birds and mammals, including humans, and causing various infections, especially of the eyes, as trachoma, lungs, as psittacosis, and genitourinary tract, as urethritis or chlamydia.

Pathology. Also called lym·pho·gran·u·lo·ma ve·ne·re·um [lim-f, uh, -gran-y, uh, -, loh, -m, uh, v, uh, -, neer, -ee-, uh, m]. a widespread, often asymptomatic sexually transmitted disease caused by Chlamydia trachomatis, a major cause of nongonococcal urethritis in men and pelvic inflammatory disease and ectopic pregnancy in women.

a contagious, purulent inflammation of the urethra or the vagina, caused by the gonococcus.