01 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 me…
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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.