Etymology
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menthol (n.)

white crystalline substance, 1862, from German Menthol, coined 1861 by Alphons Oppenheim from Latin mentha "mint" (see mint (n.1)) + oleum "oil" (see oil (n.)). So called because it was first obtained from oil of peppermint. Menthol cigarette is by 1934.

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Definitions of menthol

menthol (n.)
a crystalline compound that has the cool and minty taste and odor that occurs naturally in peppermint oil; used as a flavoring and in medicine to relieve itching, pain, and nasal congestion;
menthol (n.)
a lotion containing menthol which gives it the smell of mint;
From wordnet.princeton.edu