BIPIN'NATIFID BIQUAD'RATE, noun [Latin bis, twice, and quadratus, squared.] In mathematics the fourth power, arising from the multiplication of a square number or quantity by itself. Thus 4x4=16, which is the square of 4, and 16x16=256, the biquadrate of that number.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI