Biquadratic
BIQUADRATIC (from the Lat. bi-, bis, twice, and quadratus, squared). In mathematics, the biquadratic power or root of a quantity is its fourth power or root (see Algebra); a biquadratic equation is an equation in which the highest power of the unknown is the fourth (see Equation: Biquadratic).
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
