Source : Webster's Revised Unabridged Dictionary (1913)

Polymer \Pol"y*mer\, n. [See {Polymeric}.] (Chem.)
   Any one of two or more substances related to each other by
   polymerism; specifically, a substance produced from another
   substance by chemical polymerization. [Formerly also written
   polymere.]

Source : WordNet®

polymer
     n : a naturally occurring or synthetic compound consisting of
         large molecules made up of a linked series of repeated
         simple monomers