anta or pilaster, the
A shallow rectagular feature projecting from a wall, having a capital and a base and architecturally treated as a column.

architrave or epistyle
The lowest part of an entablature resting on the columns capitals and supporting the frieze.

cavea
Τhe auditorium or audience sitting of a theater.

greek type theatre
Theatre type developed in the Greek world during the Hellenistic period. It consists of three main parts which are not connected to each other: the cavea, the orchestra and the scene. The cavea is bigger than a semicircle, usually built on the slope of a hill and supported by retaining walls. The orchestra is circular or horse-shoe shaped and the scene is rectangular.

hyposkenion
The area under the stage of a roman theater.

kerkides (lat. cunei)
A wedge-shaped section of seats between two stepped passageways in an greek and roman theaters.

opus quadratum
Tecnhique of wall construction, in which chiselled squared blocks of stone of the same dimensions were placed in parallel lines.

orchestra
The performance space of the ancient Greek and Roman theatre, placed between the scene building and the cavea. It was usually semi-circular in shape and rarely circular.

parodos
It was one of two side passageways in an ancient Greek theatre, between the scene and the cavea, through which the chorus and the actors entered the orchestra.

pillar
Pier of square or rectangular cross-section.

proscenium (or proscaenium), the
The colonnade added in front of the skene of the ancient Greek theatre. There the intercolumnar spaces were usually closed by doors or painted panels.

scene (lat. scaena -ae)
The stage building of the ancient theaters originally used for storage but provided a convenient backing for performances.