American Heritage® Dictionary of the English Language, Fourth Edition
- n. A deep-rooted fern (Osmunda regalis) of worldwide distribution, having tall, upright, bipinnately compound fronds.
GNU Webster's 1913
- adj. (Bot.) the handsome fern Osmunda regalis. See Osmund.
- n. large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds
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