pŏlypŏdĭum (-ĭon), ii, n., = πολυπόδιον,
a kind of fern , polypody , Plin. 16, 44, 92, § 244; 26, 12, 75, § 122.
·noun A genus of plants of the order Filices or ferns. The fructifications are in uncovered roundish...
Webster's Dictionary of the English Language