adder's-tongue

noun
ad·​der's-tongue | \ ˈa-dərz-ˌtəŋ How to pronounce adder's-tongue (audio) \

Definition of adder's-tongue

1 : any of a genus (Ophioglossum, family Ophioglossaceae) of small ferns having a spore-bearing stalk resembling a serpent's tongue

First Known Use of adder's-tongue

1548, in the meaning defined at sense 1

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The first known use of adder's-tongue was in 1548

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