/ Dictionary / Index K ketone: Meaning and Definition of Find definitions for: ke•tone Pronunciation: (kē'tōn), [key] — n. Chem. any of a class of organic compounds containing a carbonyl group, CO, attached to two alkyl groups, as CHCOCH or CHCOCH. —adj. containing the ketone group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ketone (Thesaurus) ketolysis ketone body Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language