sexually transmitted disease

sexually transmitted disease Any disease that is transmitted via sexual contact; is caused by microorganisms that survive on the skin or mucous membranes of the genital area; or is transmitted via semen, vaginal secretions, or blood during intercourse. Abbreviated STD. Because the genital area provides a moist, warm environment that is especially conducive to the proliferation of bacteria, viruses, and yeasts, a great many diseases can be transmitted sexually. STDs include AIDS, chlamydia, genital herpes, genital warts, gonorrhea, syphilis, yeast infections, human papillomavirus, and some forms of hepatitis. Also known as a venereal disease. See also sexually transmitted disease in men; sexually transmitted disease in women.