The Collaborative International Dictionary
Sextic
Sextic \Sex"tic\, a. [L. sextus sixth.] (Math.) Of the sixth degree or order. -- n. (Alg.) A quantic of the sixth degree.
Wiktionary
sextic
a. (context mathematics English) Of the sixth degree or order. n. (context mathematics English) an algebraic equation or function of the fourth degree; a curve describing such an equation or function, especially a quantic of the sixth degree.