: 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
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The new isolated diterpene esters were named caffaldehydes A, B, and C.
—
Hannah Millington, MSNBC Newsweek, 19 Aug. 2025
Their Silver Rum takes inspiration from a late-17th-century Jamaican molasses recipe that is distilled in small batches in a copper pot still to produce an ester-forward Jamaican-style rum.
—Hudson Lindenberger, Forbes.com, 11 Aug. 2025
Meanwhile, olive oil esters not only condition lashes, but also add a smidge of luster.
—Conçetta Ciarlo, Vogue, 11 Aug. 2025
Organophosphate ester flame retardants (OPFRS) were used as an alternative to PBDEs, especially as a flame retardant in foams, furniture, and tech products.
—Julia Forbes, Wired News, 22 July 2025
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Hannah Millington, MSNBC Newsweek, 19 Aug. 2025
Their Silver Rum takes inspiration from a late-17th-century Jamaican molasses recipe that is distilled in small batches in a copper pot still to produce an ester-forward Jamaican-style rum.
—Hudson Lindenberger, Forbes.com, 11 Aug. 2025
Meanwhile, olive oil esters not only condition lashes, but also add a smidge of luster.
—Conçetta Ciarlo, Vogue, 11 Aug. 2025
Organophosphate ester flame retardants (OPFRS) were used as an alternative to PBDEs, especially as a flame retardant in foams, furniture, and tech products.
—Julia Forbes, Wired News, 22 July 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 12 Sep. 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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