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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.
Menthol is the primary active ingredient found in peppermint oil believed to reduce sinus and chest congestion. Menthol acts as an expectorant, thinning the mucus and breaking up phlegm. Additional research is needed to better evaluate the impact of menthol and peppermint oilâs other components on respiratory functions. Methods of Use