Narthex

Vestibule before the main entrance to a Christian church, less sacred than the church proper.

Sacristy

Room in Christian churches for the storage of liturgical vestments, sacred vessels and parish records.

Hagioscope

Obliquely cut opening in the chancel wall of a Christian church.

Rood screen

Screen separating the chancel from the nave, typically in late medieval Christion churches.

Ambulatory

General term for a covered walkway, and more specifically for the walkway linking the two chancel aisles behind the high altar.

Cloister

Covered walkway usually set out in the form of a square.

Presbytery

Part of the chancel in a Christian church housing the altar, or a residence for Roman Catholic priests.