Dictionary![]() ![]() ke•tonePronunciation: (kē'tōn), [key] —n. Chem. any of a class of organic compounds containing a carbonyl group, CO, attached to two alkyl groups, as CH3COCH3 or CH3COC2H5. —adj. containing the ketone group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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