(in ancient Greece) a potsherd, especially one used as a ballot on which the name of a person voted to be ostracized was inscribed.
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British Dictionary definitions for ostracon
(in ancient Greece) a potsherd used for ostracizing
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