The Collaborative International Dictionary of English v.0.48:

Quantic \Quan"tic\, n. [L. quantus how much. See Quantity.]
   (Math.)
   A homogeneous algebraic function of two or more variables, in
   general containing only positive integral powers of the
   variables, and called quadric, cubic, quartic, etc.,
   according as it is of the second, third, fourth, fifth, or a
   higher degree. These are further called binary, ternary,
   quaternary, etc., according as they contain two, three, four,
   or more variables; thus, the quantic ? is a binary cubic.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quantic
    n 1: a homogeneous polynomial having at least two variables