ester

es·ter   (ěs'tər)    n.  Any of a class of organic compounds corresponding to the inorganic salts and formed from an organic acid and an alcohol. [German, short for Essigäther : Essig, vinegar (from Middle High German ezzich, from Old High German ezzīh, from Latin acētum; see ak- in Indo-European roots) + Äther, ether (from Latin aethēr; see ether).]

Main Entry: es·ter
Pronunciation: 'es-t&r
Function: noun
: any of a class of often fragrant compounds that can be represented by the formulaRCOOR′ and that are usually formed by the reaction between an acid and an alcohol usually with elimination of water

ester es·ter (ěs'tər)
n.
Any of a class of organic compounds corresponding to the inorganic salts and formed from an organic acid and an alcohol, usually with the elimination of water.