Source : Webster's Revised Unabridged Dictionary (1913)

Polypodium \Pol"y*po`di*um\, n. [L., fr. Gr. ?, dim. of ?. See
   {Polyp}, and cf. 2d {Polypode}.] (Bot.)
   A genus of plants of the order {Filices} or ferns. The
   fructifications are in uncovered roundish points, called
   sori, scattered over the inferior surface of the frond or
   leaf. There are numerous species.

Source : WordNet®

Polypodium
     n : a genus of ferns belonging to the family Polypodiaceae and
         having rounded naked sori [syn: {genus Polypodium}]