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Noun rock brake has 3 senses
  1. cliff brake, cliff-brake, rock brake - any of several small lithophytic ferns of tropical and warm temperate regions
    --1 is a kind of fern
    --1 is a member of Pellaea, genus Pellaea
    --1 has particulars:
     coffee fern, Pellaea andromedifolia; purple rock brake, Pellaea atropurpurea; bird's-foot fern, Pellaea mucronata, Pellaea ornithopus
  2. rock brake - dwarf deciduous lithophytic ferns
    --2 is a kind of     fern
    --2 is a member of Cryptogramma, genus Cryptogramma
    --2 has particulars:
     American rock brake, American parsley fern, Cryptogramma acrostichoides; European parsley fern, mountain parsley fern, Cryptogramma crispa
  3. rock polypody, rock brake, American wall fern, Polypodium virgianum - chiefly lithophytic or epiphytic fern of North America and east Asia
    --3 is a kind of polypody
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