From Longman Dictionary of Contemporary Englishsexually transmitted diseaseˌsexually transˌmitted disˈease noun [countable, uncountable] MISY (abbreviation STD) a disease that one person passes to another through having sex, such as AIDS or herpes
Examples from the Corpus
sexually transmitted disease• To what extent is vaginal candidiasis a sexually transmitted disease?• Recently I treated her for a sexually transmitted disease with metronidazole, which is known to cause foetal abnormalities in rats.• When she asked him if he had a sexually transmitted disease, he said no. 