/ Dictionary / Index D dimethylketone: Meaning and Definition of Find definitions for: di•meth•yl•ke•tone Pronunciation: (dī-meth"ul-kē'tōn), [key] — n. Chem. acetone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dimethylketol dimethylmethane Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language