from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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
- n. tropical American fern with brown scaly rhizomes cultivated for its large deeply lobed deep bluish-green fronds; sometimes placed in genus Polypodium
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