Source : Webster's Revised Unabridged Dictionary (1913)

Polyphyletic \Pol`y*phy*let"ic\, a. [Poly- + Gr. ? clan.]
   (Biol.)
   Pertaining to, or characterized by, descent from more than
   one root form, or from many different root forms;
   polygenetic; -- opposed to {monophyletic}.