/ Dictionary / Index B biradical: Meaning and Definition of Find definitions for: bi•rad•i•cal Pronunciation: (bī-rad'i-kul), [key] — n. Chem. diradical. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biradial biramous Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language