/ Dictionary / Index D diazomethane: Meaning and Definition of Find definitions for: di•az•o•meth•ane Pronunciation: (dī-az"ō-meth'ān, -ā"zō-), [key] — n. Chem. a yellow, odorless, toxic, explosive gas, CHN, used chiefly as a methylating agent and in organic synthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diazole diazonium Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language