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say it: EH-stur
ester is a noun meaning "organic compound formed by reaction between an acid and an alcohol with elimination of water". It carries one recorded sense.
organic compound formed by reaction between an acid and an alcohol with elimination of water
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ester come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.