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AbacusFlat top of the capital of a column.
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AbbeyMain or sole church built in conjunction with an abbey
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AbbeyA building inhabited by a community of monks or nuns governed by an autonomous leader
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Abutment
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AltarA structure on which to place or sacrifice offerings to a deity. In a Christian church the altar is usually a stone table or slab on supports, on which the celebration of the sacrament takes place.
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AlureA passage or gallery behind a parapet at the top of a wall of a fortification.
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AmbulatoryA semicircular or polygonal aisle. Often an ambulatory leads around the east end of the choir.
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ApseThe semi-circular termination of the east end of the chancel or chapel.
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Apsidiole
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ArcadeA series of arches supported by columns or piers.
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Arcature
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ArchA carved structural member that spans an opening.
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Arch moulding
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ArchitraveThe beam which extends across the top of the columns; it forms the lowest part of the entablature.
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Archivolt
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Arms of a transeptSections of the transept on each side of the crossing.
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AstragalA small plain or ornamental moulding.
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Attic
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Avant-corpsPart of a building which projects prominently from the main facade.