essential oil

noun

: any of a class of volatile oils that give plants their characteristic odors and are used especially in perfumes and flavorings, and for aromatherapy compare fixed oil

Examples of essential oil in a Sentence

Recent Examples on the Web
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For even more odor-fighting power, Rochester recommends combining 2 teaspoons of citric acid, a half cup of water, 10 drops of tea tree oil, and 20 drops of pine essential oil in a spray bottle. Hallie Milstein, Southern Living, 10 Feb. 2026 Add 20 drops of your favorite essential oil to 2 cups of vinegar and label the bottle. Mary Marlowe Leverette, The Spruce, 10 Feb. 2026 In addition to their delightful fragrance, when grown on patios, these flowers can help repel mosquitoes due to their essential oil, which mosquitoes find unpleasant. Sj McShane, Martha Stewart, 9 Feb. 2026 Guests can also try the Kneipp path, a hydrotherapy treatment that involves alternating hot and cold water, and experience the traditional Finnish Aufguss ritual, where water or ice infused with essential oils is poured over hot stones, releasing aromatic steam for detoxification purposes. Andrea Onate, Footwear News, 6 Feb. 2026 See All Example Sentences for essential oil

Word History

First Known Use

1674, in the meaning defined above

Time Traveler
The first known use of essential oil was in 1674

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Cite this Entry

“Essential oil.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/essential%20oil. Accessed 14 Feb. 2026.

Medical Definition

essential oil

noun
: any of a large class of volatile odoriferous oils of vegetable origin that give plants their characteristic odors and often other properties, that are obtained from various parts of the plants (as flowers, leaves, or bark) by steam distillation, expression, or extraction, that are usually mixtures of compounds (as aldehydes or esters), and that are used often in the form of essences in perfumes, flavorings, and pharmaceutical preparations

called also ethereal oil, volatile oil

compare fatty oil, fixed oil

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