Ampitheater- arena with raked seating arranged around circle floor


Apse- termination of a name of a basilica or the choir in a basilican church



Aqueduct- pipe for conducting water under gravity flow. term often applied to the arched structure built to support the pipe across the valleys


Barrel vault- semicircular vault over a rectangular space


Basilica- “kings hall” public administration. rectangular building that has a central section with a higher roof

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Flanked by lower aisles on both sides. semicircle set on one side
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Bay- building mosule defined bu repitition of an element such as a column or pier



Blind opening- framed element like a window applied to a wall but lacking an opening to the outside.



Caldarium- hot or sweating bath chamber in roman baths or thermae.

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Cardo- etruscan and roman cities, principal north-south road

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Castrum-roman military camp or garrison



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Entering- wooden scaffold or form required to support a masonry vault or arch while under construction

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Concrete- plastic building material consisting sand water cement and aggregate which hardens to  a stone-like 

consistency

Decumanus- etruscan and roman cities, the principle east-west road

Drum- cylindrical volume supporting a dome

Exedra-semicircular niche, often used as a seat of honor or place for a statue

Frigidarium- cold water baths in roman thermae

Gallery- passage over the aisle in medieval churches

Groin vault- formed by 2 intersecting barrel vaults. also known as a cross vault



Hemicylce- semicircular room or recess



Impluvium- roman houses, shallow pool that collected rain water draining from the atrium roof

Insula- roman apartment house

Keystone- central voussoir of an arch



Oculus- circular opening at the apex of a dome (light source)


Opus incertum- roman walls built or irregularly shaped stones facing a concrete core

Opus listatum- roman walls constructed of stone and brick in alternante courses

Opus quadratum- roman wall built of squared masonry

Opus reticulatum- roman wall formed of pyramidal stones, their points set inward and their square heads set to form a diagonal grid

Opus testaceum- roman wall constructed of brick facing on a concrete core

Palaestra- roman building used for exercise, a gymnasium

Pavilion- prominent feature in facade compostion usually at the center or at the ends typically set forward raised higher and capped with a distinctive roof form

Peristyle- colonnaded court or garden

Piazza- open space surrounded by buildings, in 19th century american architecture, the term is sometimes applied to a porch on a house

Tablinium- roman atrium bouses, usually on axis with the entrance

Thermae- roman baths usually containing rooms for hot, warm and cold water baithing

Triclinium- dining room in roman houses and palaces

Triumphal arch- gateway structure. 1 or 3 arched openings built to celebrate return of conquering army

Villa-rural house



Chevron- a zig zag wall