IPA: /sæˈkrɛəriəm/
KK: /sæˈkrɛəriəm/
A special place in a church or temple where sacred objects are kept or where religious ceremonies take place.
The priest prepared the altar in the sacrarium for the upcoming service.
Sacrarium is derived from "sacer" (meaning sacred or holy) and the suffix "-arium" (meaning a place for). The word refers to a place that is set apart for sacred purposes, often used in a religious context.
Think of 'sacred' to remember that a 'sacrarium' is a special place dedicated to holy purposes.