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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.
Plants containing menthol. Curiously, it is not the essential oil of mints ( Mentha spp.) the part of a plant which contains more menthol, but the essential oil of sunflower (Helianthus annuus), followed by mint species, such as Mentha arvensis, Mentha piperita, Mentha pulegium, and Mentha aquatica.