Victorian Turkish baths are a type of bath where the immersion of the body takes place in the medium of hot dry air, contrasting with, for example, the Hammam where the air is vapourous. Bathers take Victorian Turkish baths to induce a cleansing and relaxing sweat.
The plural form is chosen to aid a consistent approach since the term is used both as a set of members, and also as a member of that set. The names of individual establishments can include either singular or plural form.