essential oil

Definitions

General Science

  • noun an oil from a plant, used in cosmetics, analgesics or antiseptics, e.g. peppermint oil.

Food

  • The oily compounds secreted by or extracted from plants, flowers and fruit which have a concentrated aroma. Used in flavourings.

Medical

  • noun a medicinal or fragrant oil distilled from some part of a plant
http://www.dictionarycentral.com/definition/essential-oil.html