The Collaborative International Dictionary
Sacrarium \Sa*cra"ri*um\, n.; pl. -ria. [L., fr. sacer sacred.]
A sort of family chapel in the houses of the Romans, devoted to a special divinity.
The adytum of a temple.
--Gwilt.In a Christian church, the sanctuary.
Wiktionary
n. 1 (''in Ancient Rome'') A place where sacred objects were kept, either in a temple (the adytum) or in a house (holding the penates) 2 The area surrounding the altar of a Christian church; the sanctuary or piscina. Sometimes specifically a drain directly to the earth, perhaps including reference to a basin, for washing vessels from consecration.
Usage examples of "sacrarium".
At Rome where he was worshipped as Mars and as Quirinus he had a sacrarium on the Palatine Hill in the Roma Quadrala of Romulus.
Much is made of the altar stones and sacraria of temples, but nothing of the cloisters where lovers rendezvoused and friends gossiped, and the courtyards where children played.