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cramp ball

British

noun

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

"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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023