Lavabo

noun

1. A ritual involving the washing of one's hands at a church's offertory before handling the Eucharist.
2. The small towel used to dry the priest's hands following the ritual.
3. A washbasin, particularly the one in a church used in the ritual.
4. A trough used for washing at some medieval monasteries.
5. A lavatory: a room used for urination and defecation.