Webster's Online Dictionary
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Definition: ADDER'S-TONGUE

Part of SpeechDefinition
Noun1. A genus of ferns (Ophioglossum), whose seeds are produced on a spike resembling a serpent's tongue.[Websters]
2. The yellow dogtooth violet.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "ADDER'S-TONGUE" was first used in popular English literature: sometime before 1914. (references)