Gothic cathedral
The architectural style of the medieval cathedral (12th century to the Renaissance) is characterized mainly by its ribbed, ogival vaults.
Lady chapel 
Chapel located beyond the walls at the back of the cathedral, in the axis of the nave.
choir 
Area just beyond the transept where the clergy stand during the liturgy.
apsidiole 
Small lateral chapel arranged in a semicircle behind the choir surrounding the apse.
crossing 
Area located at the crossing of the transept and the nave of the cathedral.
abutment 
Masonry structure on which a flying buttress rests to transfer the weight of the vault.
flying buttress 
Masonry structure in the shape of a partial arch; it supports a wall by transferring the pressure of the vaults onto an abutment.
belfry 
Small steeplelike ornament in the shape of a pyramid; it is found on the corners of the transept or on each side of the façade.
transept spire 
Tapering part in the shape of a pyramid that surmounts the tower located at the transept crossing.