From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ester \Es"ter\, noun [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.
From WordNet (r) 3.0 (2006) [wn]:
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