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The Collaborative International Dictionary
Adder's-tongue

Adder's-tongue \Ad"der's-tongue`\, n. (Bot.)

  1. A genus of ferns ( Ophioglossum), whose seeds are produced on a spike resembling a serpent's tongue.

  2. The yellow dogtooth violet.
    --Gray.

Wiktionary
adder's-tongue

n. 1 Any of a genus of ferns (''Ophioglossum''), whose spores are produced on a spike resembling a serpent's tongue. 2 The yellow dogtooth violet.

Usage examples of "adder's-tongue".

So did yellow and lavender adder's-tongues, which told Gorgidas of Sivas' skill.