Dais Raised area where the lord's chair is positioned

Dalmatic Deacon's (also bishop's) vestment (See TUNICLE)

Daughter House Foundation of an abbey by monks from another abbey. Initial community consisted of 13 monks, one of which was the group leader.

Day Stairs Stairs usually leading from the cloister to the dorter (sleeping hall).

Dean The head of the group of people running the cathedral (Chapter)

Deanery Where the Dean lived

Decani The south side of the choir on which the Dean sits. Usually in a Cathedral

Diocese Area under the jurisdiction of a Bishop

Dormitory The room where the choir monks slept

Dorter Shared sleeping hall (dormitory) for monks

Encaustic Tiles Tiles used in medieval cathedrals having the patterns burnt into them

Feretory The shrines containing the sacred relics of saints

Frater Large common dining room in an abbey. Strict rules of procedure and silence were observed while readings were given.