Bipupillate

[Lat. bis, and pupilla, the pupil of the eye.] (Zool.) A term applied when an eye-like spot on the wing of a butterfly has two dots or pupils within it of a different color. Biquadrate, ( bi - kwod'rāt . ) [Lat. bis , and quadratus , squared.] The same as BIQUADRATIC. Biquadrat'ic, n. ( Alg .) The power immediately succeeding the cube; that is the square of the square, or fourth power; as, 16 is the B. or B. power of 2; for 2X2 is 4, and 4X4 is equal to 16. -a. Belonging to the fourth or biquadratic power. - B. Root of a number is the square root of its square root; thus the biquadratic root of 81 is 3; for the square root of 81 is 9; and the square root of 9 is 3. Biquadratic Equation, an equation where the unknown quantity of one of the terms has four dimensions. Any biquadratic equation may be generated by the multiplication of four simple equations; or by that of two quadratic equations. (Geom.) B. Parabola . A curve line of the third order, having two infinite legs tending the same way.