There are various synonyms for the term "Lock hospital," which is a hospital or clinic where patients suffering from sexually transmitted diseases are admitted and treated. Some alternative terms used for such hospitals include venereal disease hospital, STD clinic, STI center, or sexual health clinic. These facilities offer screening and treatment services for patients with sexually transmitted infections like HIV, chlamydia, gonorrhea, syphilis, and others. The term "Lock hospital" was popularly used during the 19th century and is derived from the name of a military hospital in London that used to treat sailors who acquired STDs during voyages. The use of this term has declined over time, and newer, more inclusive names have become popular.