• synonyms


noun Chemistry.
  1. any of a class of organic compounds containing a carbonyl group, CO, attached to two alkyl groups, as CH3COCH3 or CH3COC2H5.
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  1. containing the ketone group.
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Origin of ketone

1850–55; < German Keton, aphetic alteration of Aceton acetone
Related formske·ton·ic [ki-ton-ik] /kɪˈtɒn ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ketonic

Historical Examples

  • That the amino-acids actually yield the corresponding -ketonic acids when treated with yeast and sugar solution.

    Alcoholic Fermentation

    Arthur Harden

  • The reactions of cellulose certainly indicate that the CO- group is ketonic rather than aldehydic.

  • Among organic bodies the phenomenon is particularly well marked with the ketonic compounds and others of the same type.

  • It unites with aldehydes to form esters of ketonic acids, and with aniline yields anilido-acetic acid.

British Dictionary definitions for ketonic


  1. any of a class of compounds with the general formula R′COR, where R and R′ are alkyl or aryl groupsSee also acetone
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Derived Formsketonic (kɪˈtɒnɪk), adjective

Word Origin

C19: from German Keton, from Aketon acetone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ketonic



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-.

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Online Etymology Dictionary, © 2010 Douglas Harper

ketonic in Medicine


  1. Any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ketonic in Science


  1. Any of a class of organic compounds having the general formula RCOR, where R and R are hydrocarbon radicals that are both attached to the carbon atom of the carbonyl (CO) group. Acetone is a ketone.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.