The Collaborative International Dictionary of English v.0.48:

menthol \men"thol\, n. [Mentha + -ol.] (Chem.)
   A white, crystalline, aromatic substance (C10H20O)
   resembling camphor, extracted from oil of peppermint
   (Mentha); -- called also mint camphor or peppermint
   camphor. It has the peculiar effect on skin and membranes of
   making them feel cool, and is used in liqueurs, confections,
   cigarettes, cough drops and perfumes, among other things.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Mint \Mint\ (m[i^]nt), n. [AS. minte, fr. L. mentha, Gr. mi`nqa,
   mi`nqh.] (Bot.)
   The name of several aromatic labiate plants, mostly of the
   genus Mentha, yielding odoriferous essential oils by
   distillation. See Mentha.
   [1913 Webster]

   Note:

   Corn mint is Mentha arvensis.

   Horsemint is Mentha sylvestris, and in the United States
      Monarda punctata, which differs from the true mints in
      several respects.

   Mountain mint is any species of the related genus
      Pycnanthemum, common in North America.

   Peppermint is Mentha piperita.

   Spearmint is Mentha viridis.

   Water mint is Mentha aquatica.
      [1913 Webster]

   Mint camphor. (Chem.) See Menthol.

   Mint julep. See Julep.

   Mint sauce, a sauce flavored with spearmint, for meats.
      [1913 Webster]