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ester.

A compound most often formed by the condensation of an alcohol and an acid, with elimination of water, which contains the functional group carbon-oxygen double bond (i.e., carbonyl) joined via carbon to another oxygen atom.

5 characters2 syllables approx.English language

Meaning & usage

noun/ˈɛstɚ/General-American/ˈɛstə/Received-Pronunciation
  1. A compound most often formed by the condensation of an alcohol and an acid, with elimination of water, which contains the functional group carbon-oxygen double bond (i.e., carbonyl) joined via carbon to another oxygen atom.

Where this word comes from

Etymology tree Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *-sḱéti Proto-Italic *-skō Latin -scō Latin acēscō Proto-Indo-European *-tós Proto-Italic *-tos Latin -tus Latin acētumbor. Proto-West Germanic *aket Proto-West Germanic *atek Old High German eȥȥih Middle High German eȥȥich German Essich German Essig Proto-Indo-European *h₂eydʰ-der. Proto-Hellenic *áitʰō Ancient Greek αἴθω (aíthō) ▲ Ancient Greek ᾱ̓ήρ (āḗr)influ.? Ancient Greek αἰθήρ (aithḗr)der. Latin aethērbor. German Äther blend? German Esterbor. English ester Borrowed from German Ester, possibly a blend of Essig + Äther. See ether for more.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.