dryopteris filix-mas

from WordNet (r) 3.0 (2006)
Dryopteris filix-mas
    n 1: fern of North America and Europe whose rhizomes and stalks
         yield an oleoresin used to expel tapeworms [syn: {male
         fern}, {Dryopteris filix-mas}]
from The Collaborative International Dictionary of English v.0.48
male fern \male fern\ n.
   A fern of North America and Europe ({Dryopteris filix-mas})
   whose rhizomes and stalks yield an oleoresin used to expel
   tapeworms. It is a member of the woodfern genus.
   [WordNet 1.5]
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