/ Dictionary / Index D dimethylhydrazine: Meaning and Definition of Find definitions for: di•meth•yl•hy•dra•zine Pronunciation: (dī-meth"ul-hī'dru-zēn", -zin), [key] — n. Chem. a flammable, highly toxic, and colorless liquid, CHN, used as a component in jet and rocket fuels. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dimethylcarbinol dimethylketol 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