lavabo

noun

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