Breadcrumb Home > Dictionary > Index D diel: Meaning and Definition of Find definitions for: di•el Pronunciation: (dī'ul, dē'-), [key] — adj. Biol. of or pertaining to a 24-hour period, esp. a regular daily cycle, as of the physiology or behavior of an organism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. die-hard dieldrin TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: miasma Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language