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From: WordNet (r) 2.0

 adder's fern
      n : mat-forming lithophytic or terrestrial fern with creeping
          rootstocks and large pinnatifid fronds found throughout
          North America and Europe and Africa and east Asia [syn: common
           polypody, wall fern, golden maidenhair, golden
           polypody, sweet fern, Polypodium vulgare]