| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Noun | 1. A genus of ferns (Ophioglossum), whose seeds are produced on a spike resembling a serpent's tongue.[Websters]
2. The yellow dogtooth violet.[Websters]. | |
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Date "ADDER'S-TONGUE" was first used in popular English literature: sometime before 1914. (references) |