caddichus

noun2

1. •
   (historical) In ancient Sparta, a deep basin used in a form of voting or election, particularly for membership in common messes (syssitia).
2. •
   (historical) A person rejected from membership in a Spartan common mess through the voting process that used such a basin.

   • The basin was called caddichus, and the rejected candidate had a name thence derived. — 1847