Sacrarium
sacrarium
(Latin: fish-pond or basin)
Also called a sacrarium, thalassicon, or fenestbella, the baptismal font, or the cistern into which the water flows after baptism. Also an excavation about two or three feet deep and one foot wide, covered with a stone slab, to receive the water from the washing of the priest’s hands and the water used for washing the palls, purifiers, and corporals; also the bread crumbs, cotton, etc., after the sacred unctions, and the ashes of sacred things no longer fit for use. It is generally constructed near the altar at the south wall of the sanctuary or in the sacristy. It is sometimes in the form of a perforated stone basin, or a small column or niche of stone or metal.
Fuente: New Catholic Dictionary
Sacrarium
a term employed by the ancient Romans to denote any place in which sacred things were deposited. A sacrarium was either public or private, the former being a part of a temple in which the idol stood, and the latter the part of a private house in which the Penates were kept. In the early Latin Church the name was given to the chancel or bema, and also to the side table (oblationarium) on which the offerings of the people were deposited.