pennyroyal oil
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pennyroyal oil
[¦pen·ē¦rȯi·əl ‚ȯil] (materials)
An essential oil distilled from the dried leaves and tops of the small pennyroyal plants Hedeoma pulegioides or Mentha pulegium; used as a counterirritant in liniments, in insect repellents, and for the production of methanol.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.