[STD] n [sexually transmitted disease] (1976): any of various diseases transmitted by direct sexual contact that include the classic venereal diseases (as syphilis, gonorrhea, and chancroid) and other diseases (as hepatitis A, hepatitis B, giardiasis, and AIDS) that are often or sometimes contracted by other than sexual means
STD
Meaning of STD in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012