: 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 has made chemical recycling – breaking the ester bonds to recover the original chemical building blocks – an increasingly important goal.
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Bojan Stojkovski, Interesting Engineering, 16 Nov. 2025
Of the typical five ingredients in LNPs, ionizable lipids are particularly important for vaccine strength, and so the researchers created a catalogue of new ionizable lipids containing cyclic structures, which aid delivery of mRNA, and esters which may enhance biodegradability.
—New Atlas, 14 Nov. 2025
The luxe liquid exfoliates skin with tiny pieces of volcanic rock, eliminates garlic and onion odors with bread yeast enzymes, and softens hands with olive oil esters.
—Mark Marino, Bon Appetit Magazine, 31 Oct. 2025
Its ethos centers around Belgian styles, such as the saison, which leverage yeast to develop fruity esters and flavors.
—Tiney Ricciardi, Denver Post, 30 Sep. 2025
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Bojan Stojkovski, Interesting Engineering, 16 Nov. 2025
Of the typical five ingredients in LNPs, ionizable lipids are particularly important for vaccine strength, and so the researchers created a catalogue of new ionizable lipids containing cyclic structures, which aid delivery of mRNA, and esters which may enhance biodegradability.
—New Atlas, 14 Nov. 2025
The luxe liquid exfoliates skin with tiny pieces of volcanic rock, eliminates garlic and onion odors with bread yeast enzymes, and softens hands with olive oil esters.
—Mark Marino, Bon Appetit Magazine, 31 Oct. 2025
Its ethos centers around Belgian styles, such as the saison, which leverage yeast to develop fruity esters and flavors.
—Tiney Ricciardi, Denver Post, 30 Sep. 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 27 Nov. 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
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