proaulion
/prəʊˈɔːlɪən/Archaeol. and Architecture
noun
A vestibule or forecourt in a church or temple; specifically a portico or colonnade opening into the narthex.
Origin
Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From Hellenistic Greek προαύλιον vestibule from ancient Greek προ- + αὐλή court + -ιον, diminutive suffix.