Noun has 3 senses

• rock brake(n = noun.plant) cliff brake, cliff-brake - any of several small lithophytic ferns of tropical and warm temperate regions;




• rock brake(n = noun.plant) - dwarf deciduous lithophytic ferns;




• rock brake(n = noun.plant) american wall fern, polypodium virgianum, rock polypody - chiefly lithophytic or epiphytic fern of North America and east Asia;