Abacisus

A small piece of stone used in a mosaic work.

Abacus

The uppermost member of the capital of a column; often a plain square slab, but sometimes molded or otherwise enriched.

Abamurus

A buttress or second wall added to strengthen another

 

Abaton

A sanctuary not to be entered by the public; a holy of holies. Abaton was a sacred place for the ancient Egyptians, situated on the island of Bigeh in the Nile River.

 

Abbey

A house or place of residence occupied by a community of persons living in seclusion under religious vows.

Abutment

A masonry mass which receives the thrust of an arch, vault or strut.

Ablaq

In Islamic architecture, masonry laid in courses of different colors giving a striped effect.

 

Acanthus

A common plant of the Mediterranean, whose leaves, stylized, form the characteristic decoration of capitals of Corinthian and Composite orders. In scroll form it appears on friezes, panels, etc.

Accordion Partition

A fabric-faced door which is hung from an overhead track and folds back like the bellows of an accordion. Typically used in religious properties by allowing overflow space to be walled off when not in use or to create smaller classrooms or meeting rooms out of a larger assembly area.

Accouplement

The placement of columns or pilasters close together in pairs.

Acoustical Material

A material usually fibrous designed to absorb sound.

Acoustical Panel

 

Acoustical Plaster

A special low-density sound-absorptive plaster, applied in the form of a finish coat, designed to provide a continuous finished surface.

Acoustics

The science of sound, including the generation, transmission, and effects of sound waves. The totality of those physical characteristics of an auditorium or room such as the size and shape of elements on the walls or ceiling which scatter sound, the amount of sound absorption and noise level within the room.

Acrolith

A statue or sculptured figure in which only the head, hand and feet are of stone, the rest being usually of wood.

Acropodium

An ornament, such as a statue placed at the pinnacle or corners of a roof of a structure, particularly if raised from the sub-structure on supports. The plinth of a statue if resting on supports.

Acropolis

The elevated stronghold of a Greek city, usually with the temple of the patron divinity. The Acropolis in Athens (shown to the right) Any elevated group of buildings serving as a civic symbol.

Acroterion

A pedestal at the corners or peak of a roof to support an ornament, or the ornament itself.

Acute Arch

An arch with a sharply pointed apex and narrow width. Also known as lancet arch.

Adytum

The inner shrine of a temple reserved for priests. The most sacred part of a place of worship. Adytum is a Latinized form of Greek meaning "not to be entered", the innermost sanctuary in ancient temples, access to which was forbidden to all but the officiating priests. The most famous adytum in Greece was in the Temple of Apollo at Delphi.