Is it farther or further?
chemical group, 1851, from German keton, coined in 1848 by German chemist Leopold Gmelin (1788-1853) from German Aketon, from French acétone (see acetone). Its comb. form is keto-.
ketone ke·tone (kē'tōn')n. Any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals.