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cinnamon fern
a large, New World fern (Osmunda cinnamomea, family Osmundaceae) having sterile green fronds and other fronds that bear spores and turn a cinnamon color as the spores mature
See cinnamon fern in American Heritage Dictionary 4
noun
A New World fern (Osmunda cinnamomea) having narrow, spore-bearing, cinnamon-colored leaves in early spring, which are later encircled by wider sterile green leaves.
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