Other forms: sacristies
A sacristy is the room in a Catholic church where religious objects used during rituals like Holy Communion are stored. Things like a chalice, altar linens, and holy oils are kept in a sacristy.
A sacristy is sometimes called a vestry, although this is more typically used for the room where priests change into their vestments, or the special robes they wear during church services. And while robes might be stored in a vestry, most other holy objects are kept in the sacristy. Orthodox and Catholic churches are most likely to have a sacristy. The word literally means "repository for sacred things," from the Latin root sacer, "sacred."