Quartic \Quar"tic\, a. [L. quartus fourth.]

(Mach.) Of the fourth degree.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Quartic \Quar"tic\, n.
   (a) (Alg.) A quantic of the fourth degree. See Quantic.
   (b) (Geom.) A curve or surface whose equation is of the fourth degree in the variables.

Source: Webster's Revised Unabridged Dictionary (1913)