portal 
Ornamental architectural feature of a façade containing one or several doors.
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.
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.
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.
rose window 
Large circular bay composed of decorative tracery and stained glass; it is also called a rosette.
louver-board 
Inclined slat located in the bell tower bay; it projects the sound of the bells downward.