sacrarium

noun, plural sa·crar·i·a [suh–krair-ee-uh] /səˈkrɛər i ə/.

1. Roman Catholic Church. a piscina.
2. Ecclesiastical. the sanctuary or chancel.
3. Roman History. a shrine or sanctuary.

noun plural -craria (-ˈkrɛərɪə)

1. the sanctuary of a church
2. RC Church a place near the altar of a church, similar in function to the piscina, where materials used in the sacred rites are deposited or poured away