1. (noun) cliff brake, cliff-brake, rock brake
any of several small lithophytic ferns of tropical and warm temperate regions
Synonyms: rock brake, cliff brake, cliff-brake, rock polypody
2. (noun) rock brake
dwarf deciduous lithophytic ferns
Synonyms: rock brake, cliff brake, cliff-brake, rock polypody
3. (noun) rock polypody, rock brake, American wall fern, Polypodium virgianum
chiefly lithophytic or epiphytic fern of North America and east Asia
Synonyms: cliff brake, rock brake, rock polypody, cliff-brake
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