Definition of climbing fern
: any of several ferns of the genus Lygodium
especially
: a delicate North American fern (L. palmatum) having a twining stem, palmately lobed sterile fronds, and sporiferous fronds that are much forked, form a terminal panicle, and are highly valued for decoration
— called also creeping fern
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Merriam-Webster unabridged
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