es·​ter | \ ˈe-stər How to pronounce ester (audio) \

Definition of ester

: any of a class of often fragrant organic compounds that can be represented by the formula RCOOR′ and that are usually formed by the reaction between an acid and an alcohol with elimination of water

Examples of ester in a Sentence

Recent Examples on the Web This ensures superior absorption to fish, or algae oils in their triglyceride or ethyl ester forms, and given the presence of polar lipids, including phospholipids and glycolipids, even higher absorption than krill oil. Christopher Marquis, Forbes, 15 July 2022 Vitamin C ester, papaya enzymes and organic shea oil hydrate and gently exfoliate, leaving you with dewy skin that is delightfully scented, too. Roxanne Adamiyatt, Town & Country, 5 May 2022 The taste derived from L-aspartyl-L-phenylalnine methyl ester, a dipeptide of amino acids that is 200 times sweeter than sucrose or table sugar. Scott Lafee, San Diego Union-Tribune, 19 Apr. 2022 The company boasts that its ketone-ester drink took 15 years, and $60 million, to develop. Amby Burfoot, Outside Online, 29 July 2020 Oil can be used in many types of hydraulic equipment, but because oil is extremely flammable, the Jaws of Life typically use phosphate ester fluid, which is both non-flammable and does not conduct electricity. Stephanie Toone, ajc, 23 Feb. 2021 Most of the flavors in rum come from organic compounds called esters, which are created when alcohol molecules chemically combine with acids. al, 24 May 2020 During fermentation, yeast converts sugars into alcohol and creates pungent esters — organic compounds that might evoke peaches, oranges or pineapples. Joshua M. Bernstein, New York Times, 20 Mar. 2020 The lip balm is infused with Coconut oil and jojoba esters that deliver long-lasting moisture. Jennifer Ford, Essence, 24 Jan. 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ester.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ester

circa 1852, in the meaning defined above

History and Etymology for ester

German, from Essigäther ethyl acetate, from Essig vinegar + Äther ether

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Time Traveler for ester

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The first known use of ester was circa 1852

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Last Updated

20 Jul 2022

Cite this Entry

“Ester.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2022.

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More Definitions for ester


es·​ter | \ ˈes-tər How to pronounce ester (audio) \

Medical Definition of ester

: any of a class of often fragrant compounds that can be represented by the formula RCOOR′ and that are usually formed by the reaction between an acid and an alcohol usually with elimination of water

More from Merriam-Webster on ester

Nglish: Translation of ester for Spanish Speakers Encyclopedia article about ester


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