osmunda

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os·mun·da

 (ŏz-mŭn′də)
n.
Any of several ferns of the genus Osmunda, such as the royal fern, or formerly classified in this genus, such as the cinnamon fern, having bipinnately compound sterile fronds and separate spore-bearing fertile fronds. The fibrous roots of certain osmunda ferns were once widely used as a potting medium.

[New Latin Osmunda, genus name, from Medieval Latin osmunda, any of various ferns, especially the royal fern, from Old French osmonde, of unknown origin.]

osmunda

(ɒzˈmʌndə) or

osmund

n
(Plants) any fern of the genus Osmunda, such as the royal fern, having large spreading fronds: family Osmundaceae
[C13: from Old French osmonde, of unknown origin]