oak fern

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oak fern ‎(plural oak ferns)

  1. Any of various ferns which grow on trees and walls, specifically common polypody, formerly thought to have medicinal properties when found growing on an oak.
    • 1603, John Florio, translating Michel de Montaigne, Essays, II.12:
      Why say we, that [] to know the vertue of Reubarb, qualitie of Oak ferne, and operation of Polipodie, is only peculiar unto man?