Breadcrumb Home > Dictionary > Index D diradical: Meaning and Definition of Find definitions for: di•rad•i•cal Pronunciation: (dī-rad'i-kul), [key] — n. Chem. an atom or molecule having two unpaired electrons. Also calledCf. free radical. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Dirac delta function Dirae TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language