noun, plural la·va·boes.
1. Ecclesiastical. a.
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.
the small towel or the basin used.
(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.
a washbowl with a spigot-equipped water tank above, both mounted on a wall: now often used for decoration or as a planter.
1855–60; < Latin lavābō: I shall wash