Adder's-tongue Fern Definition
noun
Any of various ferns in the genus Ophioglossum, having an erect stem that branches into a single oval blade and a spikelike spore-bearing stalk.
American Heritage
Origin of Adder's-tongue Fern
From the resemblance of the spike at the base of the frond to a snake's tongue
From American Heritage Dictionary of the English Language, 5th Edition
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