Epinaos
EPINAOS , in architecture, the open vestibule behind the nave. The term is not found in any classic author, but is a modern coinage, originating in Germany, to differentiate the feature from "opisthodomus," which in the Parthenon was an enclosed chamber.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
