1. The ceremonial washing of the hands and recitation from the Psalms by the celebrant before the Eucharist in the Roman Catholic and Anglican churches; often capitalized as, Lavabo.
2. The ritual washing of the celebrant's hands after the offertory in the Mass, accompanied in the Roman rite by the recitation of Psalm 26:6–12.
3. In many medieval monasteries; a large stone basin equipped with a number of small orifices through which water flowed, used for the performance of ablutions.
4. A washbowl with a spigot-equipped water tank above, both mounted on a wall: now often used for decoration or as a planter.