- (Roman architecture) A vaulted corridor or arcade at, or just below ground level; normally lit by openings in the upper part of the vault. Also a roofed promenade that is enclosed with side walls that have windows or openings instead of columns.
1581, Richard Mulcaster, Positions, London: Longmans, Green and Company, published 1888, page 87:
- The close walkes, which were called cryptoporticus were not of choice but of necessitie, when extremitie of weather would not let them walke abroad.
cryptoporticus f (genitive cryptoporticūs); fourth declension
- (architecture) cryptoporticus