Biquadratic
involving the fourth, but no higher, power of the unknown or variable.
quartic (def 2).
biquadrate.
Historical Examples
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various
Outlines of Educational Doctrine John Frederick Herbart
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 Various
adjective
of or relating to the fourth power
noun
a biquadratic equation, such as x4 + x + 6 = 0
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