{Biquadratic equation} (Alg.), an equation of the fourth degree, or an equation in some term of which the unknown quantity is raised to the fourth power.

{Biquadratic root of a number}, the square root of the square root of that number. Thus the square root of 81 is 9, and the square root of 9 is 3, which is the biquadratic root of 81. Hutton. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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• Biquadratic — Bi quad*rat ic, a. [Pref. bi + quadratic: cf. F. biquadratique.] (Math.) Of or pertaining to the biquadrate, or fourth power. [1913 Webster] {Biquadratic equation} (Alg.), an equation of the fourth degree, or an equation in some term of which the …   The Collaborative International Dictionary of English

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