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rock brake

noun

  1. any of various ferns of the genera Pellaea and Cryptogramma , which grow on rocky ground and have sori at the ends of the veins
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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