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  1. involving the fourth, but no higher, power of the unknown or variable.
  1. quartic(def 2).
  2. biquadrate.

Origin of biquadratic

First recorded in 1655–65; bi-1 + quadratic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for biquadratic

Historical Examples

  • Biquadratic, bī-kwod-rat′ik, n. a quantity twice squared, or raised to the fourth power.

    Chambers's Twentieth Century Dictionary (part 1 of 4: A-D)


  • Tartaglia solved the cubic equation, and a little later Ferrari solved the biquadratic.

    Outlines of Educational Doctrine

    John Frederick Herbart

  • When a biquadratic equation has all its terms, its resolution may be always reduced to that of a cubic equation.

British Dictionary definitions for biquadratic


adjective Also: quartic
  1. of or relating to the fourth power
  1. a biquadratic equation, such as x 4 + x + 6 = 0
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012