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The Collaborative International Dictionary
Peppermint tree

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.

  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.

Wiktionary
peppermint tree

n. 1 (cx chiefly AU English) Any of several species of eucalypt which yield an essential oil that smells of peppermint, especially a member of the stringybark group. 2 (cx chiefly AU English) A tree of the family Myrtaceae bearing leaves that smell of peppermint, especially (vern: willow myrtle), (taxlink Agonis flexuosa species noshow=1).