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
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.
3. A lozenge of sugar flavored with peppermint.
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.