cel·la
(s
ĕl
ə)
n.pl. cel·lae(s
ĕl
ē)
1. The inner room or sanctuary of an ancient Greek or Roman temple, in which the statue of the god was situated.
2. In Byzantine architecture, the area of a centrally planned church in which the liturgy is performed.In both senses also callednaos.
[Latin; see kel-1 in the Appendix of Indo-European roots.]

cellaplan of the Treasury of the Athenians
Delphi, Greece