/ Dictionary / Index B biquadratic: Meaning and Definition of Find definitions for: bi•quad•rat•ic Pronunciation: (bī"kwo-drat'ik), [key] — Math. Math. —adj. involving the fourth, but no higher, power of the unknown or variable. —n. quartic (def. 2). biquadrate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biquadratic (Thesaurus) biquadrate biquarterly Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language