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Noun: rock brake  rók breyk
  1. Any of several small lithophytic ferns of tropical and warm temperate regions
    - cliff brake, cliff-brake
     
  2. Dwarf deciduous lithophytic ferns
     
  3. Chiefly lithophytic or epiphytic fern of North America and east Asia
    - rock polypody, American wall fern, Polypodium virgianum

Derived forms: rock brakes

Type of: fern, polypody

Part of: Cryptogramma, genus Cryptogramma, genus Pellaea, Pellaea