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façade 
tympanum 
Flat portion of the portal above the door and between the orders.
portal 
Ornamental architectural feature of a façade containing one or several doors.
pier 
Pillar dividing the portal in two and supporting the lintels.
pier 
Masonry pillar supporting the orders.
splay 
Recessed side of the portal that widens from its inside to its outside edge.
lintel 
Horizontal section of the door frame that fills the opening above a door or portal.
order 
Each of the receding arches that form a vault over a portal.
trefoil 
Ornamental motif comprised of three lobes.
gable 
Triangular decorative element with molded edges, located above the portal.
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.
spire 
Tapering part in the shape of a pyramid that surmounts the belfry.
gallery 
Covered passage along the cathedral’s façade, decorated with statues.
stained glass 
Translucent decorative work comprised of an assemblage of glass pieces, usually colored, that fills a bay.
tracery 
Stone framework adorning the inside of a bay.
rose window 
Large circular bay composed of decorative tracery and stained glass; it is also called a rosette.
bell tower 
Tower with bays in which the bells are hung.
louver-board 
Inclined slat located in the bell tower bay; it projects the sound of the bells downward.