A person or thing that voids or empties something. The voider was responsible for clearing the waste from the factory.
A tray or basket used in medieval times to clear the table of crumbs and leftovers. The servant used a voider to collect the remnants of the feast.
A portable chamber pot or other receptacle used for bodily waste, especially kept in a bedroom; now historical. She kept a porcelain voider under the bed for late-night necessities.