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biquadratic (not comparable)
- (mathematics) Of a polynomial expression, involving only the second, third and fourth powers of a variable, as x4 + 3x2 + 2. Sometimes extended to any expression involving the biquadrate or fourth power (but no higher powers), as x4 − 4x3 + 3x2 − x + 1.
biquadratic (plural biquadratics)