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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Any of various ferns in the genus Ophioglossum, having leaves divided into a simple, sterile blade and a slender, spikelike spore-bearing segment. Also called adder's-tongue.

Etymologies

  1. From the resemblance of the spike at the base of the frond to a snake's tongue.

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‘adder's-tongue fern’ has been looked up 159 times, added to 1 list, and is not a valid Scrabble word.