Biquadratic

a.	1.	(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 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.
n.	1.	(Math.) A biquadrate.

Noun	1.	biquadratic - an algebraic equation of the fourth degree Synonyms: biquadrate, fourth power, quartic
	2.	biquadratic - an equation of the fourth degree Synonyms: biquadratic equation
	3.	biquadratic - a polynomial of the fourth degree Synonyms: biquadratic polynomial, quartic polynomial
Adj.	1.	biquadratic - of or relating to the fourth power

biquadrate, fourth power, quartic