Organic Chemical
ester Audio
es·ter [ es-ter ]
Subclass of:
Carboxylic Acids
Definitions related to esters:
  • A chemical substance made when an acid and an alcohol combine and water is removed. Esters are found in essential oils (scented oils that come from plants).
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • Organic compound formed by removal of water from an acid and an alcohol.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Compounds derived from organic or inorganic acids in which at least one hydroxyl group is replaced by an -O-alkyl or another organic group. They can be represented by the structure formula RCOOR' and are usually formed by the reaction between an acid and an alcohol with elimination of water.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (organic ester) A compound derived from the reaction of an alcohol with an organic acid.
    NCI
    U.S. National Cancer Institute, 2021
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