Definition of adder's tongue in English:

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adder's tongue

noun

1A widely distributed atypical fern that has a single pointed oval leaf and a straight unbranched spore-bearing stem.
  • Genus Ophioglossum, family Ophioglossaceae, in particular O. vulgatum
Example sentences
  • In it grow such ferns as adder's tongue fern, bog fern, Christmas fern, crested fern, Goldie's fern, maidenhair fern, New York fern, ostrich fern, and spinulose woodfern.
  • The general conclusion was that the impact of the first year's cattle grazing had helped the adder's tongue fern to thrive.
  • Since they sprout from perennial caudices, the adder's tongue ferns were presumably established in the chamise understory.
2North American another term for dogtooth violet, especially a trout lily.
Example sentences
  • Adder's tongue is a perennial plant that grows to 1 foot high.
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