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 and all except the harts-tongue divided leaves
(C15: from Latin polypodium, from Greek, from poly- + pous foot)
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