polygonal

from WordNet (r) 3.0 (2006)

polygonal
    adj 1: having many sides or relating to a surface marked by
           polygons; "polygonal structure"

from The Collaborative International Dictionary of English v.0.48

Polygonal \Po*lyg"o*nal\, a.
   Having many angles.
   [1913 Webster]

   {Polygonal numbers}, certain figurate numbers. See under
      {Figurate}.
      [1913 Webster]