from The Century Dictionary and Cyclopedia
- n. An open vestibule behind the cella of some ancient temples, corresponding to the pronaos in front. See opisthodomos and posticum.
Sorry, no etymologies found.
There was no epinaos [room at rear of temple], but otherwise the temple is very like in plan and nearly the same size as the Theseum at Athens.
Together these formed a windowless structure called the _cella_, beyond which was the rear porch, the _posticum_ or _epinaos_.