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=== Etymology === The word ''ester'' was coined in 1848 by a German chemist [[Leopold Gmelin]],<ref>Leopold Gmelin, ''Handbuch der Chemie'', vol. 4: ''Handbuch der organischen Chemie'' (vol. 1) (Heidelberg, Baden (Germany): Karl Winter, 1848), [https://books.google.com/books?id=4ooMAQAAIAAJ&pg=PA182 page 182].<br /> Original text:<blockquote>{{lang|de|b. Ester oder sauerstoffsäure Aetherarten.<br />Ethers du troisième genre.<br /><br />Viele mineralische und organische Sauerstoffsäuren treten mit einer Alkohol-Art unter Ausscheidung von Wasser zu neutralen flüchtigen ätherischen Verbindungen zusammen, welche man als gepaarte Verbindungen von Alkohol und Säuren-Wasser oder, nach der Radicaltheorie, als Salze betrachten kann, in welchen eine Säure mit einem Aether verbunden ist.}}</blockquote>Translation:<blockquote>b. Ester or oxy-acid ethers.<br />Ethers of the third type.<br /><br />Many mineral and organic acids containing oxygen combine with an alcohol upon elimination of water to [form] neutral, volatile ether compounds, which one can view as coupled compounds of alcohol and acid-water, or, according to the theory of radicals, as salts in which an acid is bonded with an ether. </blockquote></ref> probably as a contraction of the German {{lang|de|Essigäther}}, "[[Ethyl acetate|acetic ether]]".
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