adder's-tongue

1. See adder's-tongue fern.
2. See dogtooth violet.

The noun has one meaning:

Meaning #1: ferns with fertile spikes shaped like a snake's tongue
  Synonym: adder's tongue fern

Adder's tongue is a common name for several plants:

• Ophioglossum, a class in the order Ophioglossales.
• Erythronium (also known as Fawn Lily, Trout Lily, or Dog's-tooth Violet), a genus of lilies

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