a. [ Pref. bi- + quadratic: cf. F. biquadratique. ] (Math.) Of or pertaining to the biquadrate, or fourth power. [ 1913 Webster ]
Biquadratic equation (Alg.),
Biquadratic root of a number,
n. (Math.)
a. [ Cf. F. quadratique. ] [ 1913 Webster ]
n. (Alg.) That branch of algebra which treats of quadratic equations. [ 1913 Webster ]