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