nounWord forms: plural -boes or -bos mainly Roman Catholic Church1. a. the ritual washing of the celebrant's hands after the offertory at Mass
b. (as modifier)
lavabo basin
lavabo towel
2. another name for washbasin
3. a trough for washing in a convent or monastery
Word origin
C19: from Latin: I shall wash, the opening of Psalm 26:6