Source : Webster's Revised Unabridged Dictionary (1913)

Menthol \Men"thol\, n. [Mentha + -ol.] (Chem.)
   A white, crystalline, aromatic substance resembling camphor,
   extracted from oil of peppermint ({Mentha}); -- called also
   {mint camphor} or {peppermint camphor}.

Source : WordNet®

menthol
     n : a lotion containing menthol which gives it a mint flavoring