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A fern (Osmunda regalis) of worldwide distribution, having tall fronds with widely spaced oblong leaflets.
(Plants) a fern, Osmunda regalis, of damp regions, having large fronds up to 2 metres (7 feet) in height, some of which are modified for bearing spores: family Osmundaceae
a tall, coarse osmunda fern, Osmunda regalis, having large, upright fronds, growing in wetland areas.
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|Noun||1.||royal fern - large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds|