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 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 The main fats within this food are wax esters, a fusion of a fatty acid and fatty alcohol, which most mammals find difficult to digest. Amy Apprill, The Conversation, 17 Dec. 2019 Miller and her team, including WHOI lipid chemist Benjamin Van Mooy, discovered that resident microbes in the small intestine may be vital for digesting the wax esters in bowhead whales. Amy Apprill, The Conversation, 17 Dec. 2019 After briefly trying different polymer components — amides rather than esters — Carothers turned to other research topics. Virginia Postrel, Twin Cities, 1 Nov. 2019 Then a class of chemicals called N-Hydroxysuccinimide (NHS) esters embedded in the polyacrylic acid take over, forming stronger covalent bonds with proteins in the tissue in only five seconds. Jason Daley, Smithsonian, 1 Nov. 2019

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.

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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

Time Traveler

The first known use of ester was circa 1852

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Statistics for ester

Cite this Entry

“Ester.” Dictionary, Merriam-Webster, Accessed 16 Jun. 2021.

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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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