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menthol (countable and uncountable, plural menthols) (chemistry) a cyclic monoterpene alcohol; the major component of the essential oil of peppermint; used in pharmaceutical preparations as an antitussive and antipruritic agent, as a nasal decongestant, and in menthol cigarettes.
Freebase (0.00 / 0 votes) Rate this definition: Thiol. In organic chemistry, a thiol is an organosulfur compound that contains a carbon-bonded sulfhydryl group. Thiols are the sulfur analogue of alcohols, and the word is a portmanteau of thion + alcohol, with the first word deriving from Greek Î¸Îµá¿Î¿Î½ = sulfur.