noun, plural polypodies.
any fern of the genus Polypodium, as P. vulgare, having creeping rootstocks, deeply pinnatifid evergreen fronds, and round, naked sori.

1400–50; late Middle English polypodye < Latin polypodion < Greek polypódion (> Neo-Latin Polypodium); see poly-, -pod, -ium

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World English Dictionary
polypody (ˈpɒlɪˌpəʊdɪ)
n , pl -dies
1.  any of various ferns of the genus Polypodium, esp P. vulgare, having deeply divided leaves and round naked sori: family Polypodiaceae
2.  any fern of the family Polypodiaceae, all having opaque leaves that are divided in most species
[C15: from Latin polypodium, from Greek, from poly- + pous foot]

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Ferns such as gold back ferns and polypody ferns are also found under the shade of their branches.
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