facade
the front (or outside face) of a building
oculus
a round or eyelike opening on the roof of the dome
niches
a shallow recess, especially one in a wall to display a statue or other ornament
apse
a large, semicircular recess, arched or with a domed roof, typically at the end of a church, containing the altar
flying buttresses
thick support beams forming from a separate pier, typically forming an arch with the wall it supports
dome
a rounded vault forming the roof of a building or structure, typically with a circular base
barrel vault
a vault forming a 1/2 cylinder
doric columns
the simple, circular capitals at the top of columns used in Greek and later Roman architecture
post-and-lintel construction
construction using two columns and a flat stone lain horizontally over the columns
rib vaults
pointed, intersecting vaults that allow for higher ceilings
squinch
straight or arched horizontal structures that support superstructures like domes
entablature
a horizontal, continuous lintel, supported by colomns or a wall
colonnade
a row of columns/posts supporting a roof, entablature, or arcade
pediment
the triangular upper part of the front of a building in the classical style; typically surmounting a portico of columns
pilaster
a rectangular column especially one projecting from a wall
atrium
an open roofed entrance hall
frieze
a broad horizontal band of sculpted or painted decoration (adorns the entablature)
nave
a central aisle of the church, intended to accommodate most of the congregation
voussoir
wedge shaped stones used to create arches (also referred to as keystones)
groin vault
barrel vaults that intersect at right angles
tympanum
semi-circular or triangular decorative wall surface over an entrance, door or window
roundels
a small disk, especially a decorative medallion
portal
an opening in a wall of a building especially a grand entrance to an important structure
pendentive
a curved triangle of vaulting formed by the intersection of a dome with its supporting arches
ionic columns
slender columns with curvilinear ornaments at the top used in Greek and later Roman architecture
corinthian columns
slender columns with highly ornate acnthus leaves and/or detailed capitals used in Greek and later Roman architecure