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: 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
Cannabis offers a broad spectrum of unique flavors and aromas, all derived from terpenes, esters, and other flavorants.
—Chelsea Davis, Forbes, 18 Dec. 2024
New approaches replace the mineral oil with natural esters to allow the interior of the transformer to safely reach higher temperatures, prolonging the device’s lifespan in the process.
—IEEE Spectrum, 11 Dec. 2024
Infused with fatty acids and olive oil esters, this formula nourishes your lashes from the root.
—Alyssa Brascia, People.com, 23 Nov. 2024
Formulated with niacinamide, glycerin, hydrolyzed jojoba esters and sodium hyaluronate, the toner also calms redness and breakouts, plus strengthens the skin barrier.
—Celia Shatzman, Forbes, 26 Nov. 2024
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Word History
Etymology
German, from Essigäther ethyl acetate, from Essig vinegar + Äther ether
First Known Use
circa 1852, in the meaning defined above
Dictionary Entries Near ester
Cite this Entry
“Ester.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ester. Accessed 24 Dec. 2024.
Kids Definition
ester
noun
es·ter
ˈes-tər
: an organic compound formed by the reaction between an acid and an alcohol
Medical Definition
ester
noun
es·ter
ˈes-tər
: 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
Britannica.com: Encyclopedia article about ester
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