1911 Encyclopædia Britannica/Crypto-porticus

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CRYPTO-PORTICUS (Gr. κρυπτός, concealed, and Lat. porticus), an architectural term for a concealed or covered passage, generally underground, though lighted and ventilated from the open air. One of the best-known examples is the crypto-porticus under the palaces of the Caesars in Rome. In Hadrian’s villa in Rome they formed the principal private intercommunication between the several buildings.