prothyrum
In atrio cœnobii Scallabitani e regione tumuli ejus, cernebat scalam latam atque erectam, et ab atrii Prothyro ad cœlorum usque altitudinem pertingentem.
Prothyrum
(διάθυρον). The entrance-hall of a Roman house, being a small passage between the street-door (ianua) and the house-door (ostium). The Greek πρόθυρον is the Latin vestibulum (q. v.). See domus.