cryptoporticus

noun1

1. •
   A vaulted arcade or corridor 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 openings or windows instead of columns.

   • The close vvalkes, vvhich vvere called cryptoporticus vvere not of choice but of necessitie, vvhen extremitie of vveather vvould not let them vvalke abroad. — 1581