quintic

Etymology
From.

Adjective

 * 1)  Of or relating to the fifth degree, such as a quintic polynomial which has the form $$ax^5 + bx^4 + cx^3 + dx^2 + ex + f = 0$$ (containing a term with the independent variable raised to the fifth power).

Noun

 * 1)  a quintic polynomial: $$ax^5 + bx^4 + cx^3 + dx^2 + ex + f$$