Dictionary
os•tra•con
Pronunciation: (os'tru-kon"), [key]—
n.,
—pl. -caPronunciation: (-ku). [key]
(in ancient Greece) a potsherd, esp. one used as a ballot on which the name of a person voted to be ostracized was inscribed.
Also,ostrakon.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.