Architectural elements

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Acroterion, architectural ornament on plinth	Aedicula, small shrine	Aisle, a space for walking with rows of seats on either side	Alfiz, rectangular frame around an arch
Ante-fixae, ornament at the eaves of a building covering the ends of the joint tiles of the roof	Apse, a semicircular recess covered with a hemispherical vault.	Arcade, passage or walkway covered over by a succession of arches or vaults supported by columns.	Arch, opening in a building that is curved on top.
Architrave, moulded or ornamental band framing a rectangular opening	Arcosolium, arched recess used as a burial place in a catacomb.	Arris, the sharp edge formed by the intersection of two surfaces	Arrow slit, or called Balistraria, thin vertical aperture in a fortification
Ashlar, dressed stone work of any type of stone.	Atlas, a support sculpted in the form of a man, which may take the place of a column, a pier or a pilaster	Atrium, a large open space, often several stories high and having a glazed roof and/or large windows	Attic, a space found directly below the pitched roof of a house

Ball flower, an architectural ornament in the form of a ball inserted in the cup of a flower	Baluster, a moulded shaft standing on a unifying footing and supporting the coping of a parapet or the handrail of a staircase.	Balcony, a platform projecting from the wall of a building, supported by columns or console brackets, and enclosed with a balustrade	Barrel vault, an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance
Bartizan, or guerite is an overhanging, wall-mounted turret projecting from the walls of medieval fortifications.	Battlement, a low wall around the top of a castle, or wall with gaps for shooting through	Bay, the distance between two supports of a vault or the unit of an opening and its framing on a façade	Blind arcade, an arcade that is composed of a series of arches that has no actual openings and that is applied to the surface of a wall as a decorative element
Blind arch, an arch found in the wall of a building which has been infilled with solid construction so it cannot serve as a passageway, door, or window	Bossage, a stone in a building, left rough and projecting.