involving the fourth, but no higher, power of the unknown or variable.
quartic (def 2).
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

of or relating to the fourth power
a biquadratic equation, such as x4 + x + 6 = 0


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