/ Dictionary / Index D diuron: Meaning and Definition of Find definitions for: di•u•ron Pronunciation: (dī'u-ron"), [key] — n. a white crystalline substance, CHClNO, used as a weed-killer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diurnal parallax Div. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language