WordReference Random House Unabridged Dictionary of American English © 2019
ad•der's-tongue  (adərz tung′),USA pronunciation n. 
  1. Plant Biologya fern of the genus Ophioglossum, having one or sometimes two sterile leaves and a fruiting spike.
  2. Plant Biologyany of several American dogtooth violets.

Collins Concise English Dictionary © HarperCollins Publishers::

adder's-tongue n
  1. any of several terrestrial ferns of the genus Ophioglossum, esp O. vulgatum, that grow in the N hemisphere and have a spore-bearing body that sticks out like a spike from the leaf: family Ophioglossaceae

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