Source : Webster's Revised Unabridged Dictionary (1913)

Sacrarium \Sa*cra"ri*um\, n.; pl. {-ria}. [L., fr. sacer
   sacred.]
   1. A sort of family chapel in the houses of the Romans,
      devoted to a special divinity.

   2. The adytum of a temple. --Gwilt.

   3. In a Christian church, the sanctuary.