ostrakon

noun, plural os·tra·ka [os-truh-kuh] /ˈɒs trə kə/.

1. ostracon.

noun, plural os·tra·ca [os-truh-kuh] /ˈɒs trə kə/.

1. (in ancient Greece) a potsherd, especially one used as a ballot on which the name of a person voted to be ostracized was inscribed.

noun

1. (in ancient Greece) a potsherd used for ostracizing