The Collaborative International Dictionary of English v.0.48:

Peppermint \Pep"per*mint\, n. [Pepper + mint.]
   1. (Bot.) An aromatic and pungent plant of the genus Mentha
      (Mentha piperita), much used in medicine and
      confectionery.
      [1913 Webster]

   2. A volatile oil (oil of peppermint) distilled from the
      fresh herb; also, a well-known essence or spirit (essence
      of peppermint) obtained from it.
      [1913 Webster]

   3. A lozenge of sugar flavored with peppermint.
      [1913 Webster]

   Peppermint camphor. (Chem.) Same as Menthol.

   Peppermint tree (Bot.), a name given to several Australian
      species of gum tree (Eucalyptus amygdalina, Eucalyptus
      piperita, E. odorata, etc.) which have hard and durable
      wood, and yield an essential oil.
      [1913 Webster]