<mathematics> Of or pertaining to the biquadrate, or fourth power. ... <mathematics> Biquadratic equation, 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 ... Found on http://www.encyclo.co.uk/local/20973
Bi`quad·rat'ic adjective [ Prefix bi- + quadratic : confer French biquadratique .] (Math.) Of or pertaining to the biquadrate, or fourth power. Biquadratic equation (Alg.) , an equation of the fourth degree, or an equation in some term of which the unkn... Found on http://www.encyclo.co.uk/webster/B/55