Main Entry: es·ter

Pronunciation: \ˈes-tər\

Function: noun

Etymology: German, from Essigäther ethyl acetate, from Essig vinegar + Äther ether

Date: circa 1852

: 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