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.


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