thio-alcohol

from The Century Dictionary.

• noun A substance, belonging to the class of alcohols, in which sulphur may properly be viewed as replacing oxygen in the structure of an ordinary hydroxy-alcohol, as in the case of mercaptan (C₂H₅.SH), corresponding to common or ethyl alcohol (C₂H₅.-OH). The name of this first-discovered thio-alcohol is often used generically for any substance of the class in question.