WordNet
rock brake
n. any of several small lithophytic ferns of tropical and warm temperate regions [syn: cliff brake, cliff-brake]
dwarf deciduous lithophytic ferns
chiefly lithophytic or epiphytic fern of North America and east Asia [syn: rock polypody, American wall fern, Polypodium virgianum]
Usage examples of "rock brake".
It was also called ROCK BRAKE, but he couldn't tell whether it stopped big rolling stones or broke them up into pebbles.