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The Collaborative International Dictionary of English v.0.48 (gcide)

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 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]


Biquadratic \Bi`quad*rat"ic\, n. (Math.)
(a) A biquadrate.
(b) A biquadratic equation.
[1913 Webster]

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