cella

cella (sĕl`ə), the portion of a Roman temple that was enclosed within walls, as distinct from the open colonnaded porticoes that formed the rest of it. It corresponds to the naos in Greek temples. The cella housed the statue of the deity to whom the temple was dedicated and was also used as a treasury. Sometimes it extended the whole width of the building, instead of being kept entirely within free-standing colonnades. The cella was generally a single chamber, but there were sometimes two chambers, or even three, as in the temple of Jupiter on the Capitoline Hill.

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cella

 or naos

Enclosed body of a temple (as distinct from the portico), in which the image of the deity was housed. In early Greek and Roman architecture it was usually rectangular, with an entrance at one end; the side walls were often extended to form a porch. In larger temples the cella was sometimes open to the sky. In the Byzantine architectural tradition, the naos is the area of a central-plan church where the liturgy is performed.