Keto

ketone (n.) chemical group, 1851, from German keton (1848), coined by German chemist Leopold Gmelin (1788-1853) from German Aketon, from French acétone (see acetone). "Appar. an arbitrary variation of acetone, to make a distinction" [Century Dictionary]. Its combining form is keto-. Related: Ketonic.--- Etymonline.com
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AQ-87