/ Dictionary / Index K ketone group: Meaning and Definition of Find definitions for: ke'tone group" Pronunciation: [key] — Chem. Chem. the characteristic group occurring in ketones that consists of the carbonyl group attached to two alkyl groups. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ketone body ketonemia Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language