This page is a glossary of architecture.
A
Abacus A flat slab forming the uppermost member or division of the capital of a column.
Accolade A sculptural embellishment of an arch.
Aisle The subsidiary space alongside the body of a building, separated from it by columns, piers, or posts.
Anta The posts or pillars on either side of a doorway or entrance of a Greek temple – the slightly projecting piers which terminate the side walls (of the naos).
Ante-choir The space enclosed in a church between the outer gate or railing of the rood screen and the door of the screen.
Apron 1. A raised panel below a window or wall monument or tablet. 2. An open portion of a marine terminal immediately adjacent to a vessel berth, used in the direct transfer of cargo between the vessel and the terminal. 3. A concrete slab immediately outside a vehicular door or passageway used to limit the wear on asphalt paving due to repetitive turning movements or heavy loads.
Apse A vaulted semicircular or polygonal end of a chancel or chapel. That portion of a church, usually Christian, beyond the "crossing" and opposite the nave. In some churches, the choir is seated in this space.
Araeostyle A style of intercolumniation in which the distance between columns is at least four diameters. The large interval between columns necessitates the use of a wooden architrave.
Araeosystyle An architectural term applied to a colonnade, in which the intercolumniation is alternately wide and narrow.
Arcade A passage or walkway covered over by a succession of arches or vaults supported by columns. Blind arcade or arcading: the same applied to the wall surface.
Arch A curved structure capable of spanning a space while supporting significant weight.
Architrave A formalized lintel, the lowest member of the classical entablature. Also the moulded frame of a door or window (often borrowing the profile of a classical architrave).
Area or basement area In Georgian architecture, the small paved yard giving entry, via "area steps", to the basement floor at the front of a terraced house.
Arris A sharp edge created when two surfaces converge; this includes the raised edge between two flutes on a column or pilaster, if that edge is sharp.
Arris Rail A type of rail, often wooden, with a cross-section resembling an isosceles triangle.
Arrowslit A thin vertical aperture in a fortification through which an archer can launch arrows.
Articulation The manner or method of jointing parts such that each part is clear and distinct in relation to the others, even though joined.
Ashlar Masonry of large blocks cut with even faces and square edges.
Astragal A moulding profile composed of a half-round surface surrounded by two flat planes (fillets).
Atlas A support sculpted in the form of a man, which may take the place of a column, a pier or a pilaster.
Atrium (plural: atria) The inner court of a Roman house; in a multi-story building, a toplit covered court rising through all stories.
Attic A small top story within a roof above the uppermost ceiling. The story above the main entablature of a classical façade.
B
Balconet A false balcony, or railing at the outer plane of a window.
Ball flower An architectural ornament in the form of a ball inserted in the cup of a flower, which came into use in the latter part of the 13th, and was in great vogue in the early part of the 14th century.
Baluster A small moulded shaft, square or circular, in stone or wood, sometimes metal, supporting the coping of a parapet or the handrail of a staircase. A series of balusters supporting a handrail or coping is called a balustrade.
Bar-stayed girder A structural member of inadequate capacity for its load or span that is augmented by one or two steel bars anchored to each bearing end at or above the centroid of the girder to assume the tension forces. The bar(s) runs down and below the girder and stand off the girder on one or more struts anchored to the girder at its bottom surface. The struts are sized to accept the compressive forces imposed without bending. The load limit to this member is the crippling capacity (horizontal failure) of the girder.
Bargeboard A board fastened to the projecting gables of a roof.
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 An overhanging, wall-mounted turret projecting from the walls, usually at the corners, of medieval fortifications or churches.
Basement Usually the lowest, subordinate storey of building, generally either entirely or partially below ground level; the lowest part of classical elevation, below the piano nobile.
Basilica Originally a Roman, large roofed hall erected for transacting business and disposing of legal matters; later the term came to describe an aisled building with a clerestory. Medieval cathedral plans were a development of the basilica plan type.
Batement Lights The lights in the upper part of a perpendicular window, abated, or only half the width of those below.
Batter (walls) An upwardly receding slope of a wall or column.
Battlement A parapet (i.e., a defensive low wall between chest-height and head-height), in which rectangular gaps or indentations occur at intervals to allow for the discharge of arrows or other missiles.
Bays The internal compartments of a building, each divided from the other by subtle means such as the boundaries implied by divisions marked in the side walls (columns, pilasters, etc.) or the ceiling (beams, etc.). Also, the external divisions of a building by fenestration (windows).
Bay window A window of one or more storeys projecting from the face of a building. Canted: with a straight front and angled sides. Bow window: curved. Oriel: rests on corbels or brackets and starts above ground level; also the bay window at the dais end of a medieval great hall.
Belfry A chamber or stage in a tower where bells are hung. The term is also used to describe the manner in which bricks are laid in a wall so that they interlock.
Belvedere A cupola or some other elevated structure designed as a lookout space to enjoy a view.
Bench table A stone seat which runs round the walls of large churches, and sometimes round the piers; it very generally is placed in the porches.
Bond Brickwork with overlapping bricks. Types of bond include stretcher, English, header, Flemish, garden wall, herringbone, basket, American, and Chinese.
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