Ester

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mid 19th century: from German, probably from a blend of Essig ‘vinegar’ and Äther ‘ether’.

wiktionary

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From German Ester, perhaps a contraction or abstraction of Essigäther(“ ethyl acetate”), from Essig(“vinegar”) (from Latin acetum) and Äther(“ether”). See ether for more.

etymonline

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ester (n.)

compound formed by an acid joined to an alcohol, 1852, coined in German in 1848 by German chemist Leopold Gmelin (1788-1853), professor at Heidelberg. The name is "apparently 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).