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Ester
Ester Es"ter, n. [A word invented by L. Gmelin, a German
chemist.] (Chem.)
An ethereal salt, or compound ether, consisting of an organic
radical united with the residue of any oxygen acid, organic
or inorganic; thus the natural fats are esters of glycerin
and the fatty acids, oleic, etc.
Meaning of Esters from wikipedia