Sacrarium n. : A sort of family chapel in the houses of the Romans, devoted to a special divinity.

Sacrarium n. : The adytum of a temple.

Sacrarium n. : In a Christian church, the sanctuary.

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Taxonomy
piscina, sacrarium, vessels, ground, free encyclopedia, hosts, particles, priest, shallow basin, washing, drain, sacraments, History, consecrated wine, sacred species, communion, ablutions, heads.

Defination from the web:
sacrarium is a shallow basin placed near the altar of a church, used for washing the communion vessels. ... At times the sacrarium has been used for disposal of other items, such as old baptismal water, holy oils, and leftover ashes from Ash Wednesday. In the past, ...