: 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
Bacterial fermentation can add desirable complexity to whiskey by producing lactic acid and esters.
—
Joseph V Micallef, Forbes.com, 26 Apr. 2025
The primer end of this dual-sided tube is infused with softening jojoba esters, helping your mascara swipe on more smoothly and evenly with maximum lash lengthening and separation.
—Michelle Rostamian, Allure, 8 Apr. 2025
Jojoba esters add to its silky smooth application, while ginseng extract further reduces inflammation and boosts collagen production, leaving skin looking plump and radiant.
—Conçetta Ciarlo, Vogue, 1 Apr. 2025
Keto supplements, including capsules, powders, and liquids, are more likely to contain ketone esters or salts.
—Melissa Nieves, Verywell Health, 18 Mar. 2025
See All Example Sentences for ester
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Joseph V Micallef, Forbes.com, 26 Apr. 2025
The primer end of this dual-sided tube is infused with softening jojoba esters, helping your mascara swipe on more smoothly and evenly with maximum lash lengthening and separation.
—Michelle Rostamian, Allure, 8 Apr. 2025
Jojoba esters add to its silky smooth application, while ginseng extract further reduces inflammation and boosts collagen production, leaving skin looking plump and radiant.
—Conçetta Ciarlo, Vogue, 1 Apr. 2025
Keto supplements, including capsules, powders, and liquids, are more likely to contain ketone esters or salts.
—Melissa Nieves, Verywell Health, 18 Mar. 2025
See All Example Sentences for ester
Cite this Entry
“Ester.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ester. Accessed 14 May. 2025.
Copy CitationKids 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share