Purificator

noun

1. A cloth used to clean the chalice during or after the celebration of the Eucharist.
2. In the Roman Catholic and Anglican churches, a cloth or napkin used to wipe the chalice before the mixture (krasis) and oblation, and the celebrant's fingers and mouth and the holy vessels after the ablutions.
3. One who, or that which, purifies; a purifier.
4. One who, or that which, purifies; a purifier.
5. The napkin used to wipe the lip of the chalice during Holy Communion.