biquadratic

[bahy-kwo-drat-ik] Mathematics.
adjective
1.
involving the fourth, but no higher, power of the unknown or variable.
noun
2.
quartic ( def 2 ).

Origin:
1655–65; bi-1 + quadratic

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World English Dictionary
biquadratic (ˌbaɪkwɒˈdrætɪk)
 
adj
1.  of or relating to the fourth power
 
n
2.  a biquadratic equation, such as x4 + x + 6 = 0

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Example sentences
The interpolation is accomplished by a locally fit biquadratic function.
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