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essential oil

noun
  1. any of a class of volatile oils obtained from plants, possessing the odor and other characteristic properties of the plant, used chiefly in the manufacture of perfumes, flavors, and pharmaceuticals.
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Origin of essential oil

First recorded in 1665–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for essential oil

essential oil

noun
  1. any of various volatile organic oils present in plants, usually containing terpenes and esters and having the odour or flavour of the plant from which they are extracted: used in flavouring and perfumeryCompare fixed oil See also oleoresin
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

essential oil in Medicine

essential oil

n.
  1. A volatile oil, usually having the characteristic odor or flavor of the plant from which it is obtained, used to make perfumes and flavorings.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

essential oil in Science

essential oil

[ĭ-sĕnshəl]
  1. Any of various volatile liquids, such as rose oil or lavender oil, that have a characteristic odor and are produced by plants. Essential oils are composed primarily of terpenes and of lesser quantities of alcohols, aldehydes, esters, phenols, and other compounds that impart particular odors or flavors. They are used to make perfumes, soaps, flavorings, and other products.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.