1 oak fern | Definition of oak fern
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oak fern

noun

Definition of oak fern

: a widely distributed fern (Thelypteris dryopteris) of the family Polypodiaceae chiefly of damp acid woodlands of boreal and alpine parts of the northern hemisphere that has a slender subterraneous rhizome and delicate solitary triangular fronds

History and Etymology for oak fern

translation of Latin dryopteris

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