Definition of adder's tongue in English:

adder's tongue

Line breaks: adder's tongue
(US also adder-tongue)

noun

  • 1A fern having a single pointed oval frond and a straight spore-bearing stem.
    • Genus Ophioglossum, family Ophioglossaceae, in particular O. vulgatum
    More 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.

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