ester (n.) Look up ester at Dictionary.com
compound formed by an acid joined to an alcohol, 1852, coined in German in 1848 by German chemist Leoipold Gmelin (1788-1853), professor at Heidelberg. "[A]pparently a pure invention" [Flood], perhaps a contraction of or abstraction from Essigäther, the German name for ethyl acetate, from Essig "vinegar" + Äther "ether" (see ether).

Essig is from Old High German ezzih, from a metathesis of Latin acetum (see vinegar).