peppermint

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A hybrid perennial plant (Mentha ×piperita) in the mint family, having small purple or white flowers and downy leaves that yield a pungent oil used as a flavoring and in some medicinal preparations.
• noun A candy or lozenge flavored with oil from this plant.

from The Century Dictionary.

• noun The herb Mentha piperita, native in Europe, naturalized in the United States, and often cultivated. It is notable chiefly for its aromatic pungent oil, which is often distilled. See Mentha.
• noun The oil of peppermint, or some preparation of it.
• noun A lozenge or confection flavored with peppermint.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) An aromatic and pungent plant of the genus Mentha (Mentha piperita), much used in medicine and confectionery.
• noun A volatile oil (oil of peppermint) distilled from the fresh herb; also, a well-known essence or spirit (essence of peppermint) obtained from it.
• noun A lozenge of sugar flavored with peppermint.
• noun camphor. (Chem.) Same as Menthol.
• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A hybrid herb of the mint family formed by crossing watermint and spearmint. It has a high menthol content and a sharp flavor. Used in cooking, especially in herb teas and confections.
• noun A confection containing extract of peppermint.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun red gum tree of Tasmania
• noun herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring
• noun a candy flavored with peppermint oil