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Medical Definition of Oil of pennyroyal
1. Either American or European. The former is a volatile oil derived from the flowering tops and leaves of Hedeoma pulegioides (family Labiatae). Contains pulegone and ketones. European is oil of pulegium; a volatile oil from Mentha pulegium (family Labiatae); about 85% pulegone. Has been used as an aromatic carminative, abortifacient and insect repellent. (05 Mar 2000)