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oak fern

noun
1.
a small woodland fern, Gymnocarpium dryopteris, of northern regions, having triangular, pinnate fronds that slant horizontally.
Origin
1540-1550
1540-50; translation of Latin dryopteris < Greek dryopterís, equivalent to dryo- (combining form of drŷs oak) + ptéris fern
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for oak fern

oak fern

noun
1.
a graceful light green polypody fern, Thelypteris dryopteris, having a creeping rhizome, found in acid woodlands and on rocks in the northern hemisphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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7
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