rock brake is a noun meaning "any of several small lithophytic ferns of tropical and warm temperate regions". It carries 3 recorded senses.
any of several small lithophytic ferns of tropical and warm temperate regions
dwarf deciduous lithophytic ferns
chiefly lithophytic or epiphytic fern of North America and east Asia
Definitions, synonyms and semantic relations for rock brake come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.