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Meaning of adder's-tongue

ad•der's-tongue

Pronunciation: (ad'urz-tung"), [key]
— n.
  1. a fern of the genus Ophioglossum, having one or sometimes two sterile leaves and a fruiting spike.
  2. any of several American dogtooth violets.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.