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cramp ball

noun
  1. a hard round blackish ascomycetous fungus, Daldinia concentrica, characteristically found on the bark of ash trees and formerly carried to ward off cramp. The specific name refers to the concentric rings revealed if the fungus is sliced
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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