Lewis & Short

fornĭcātus, a, um, adj. [fornix, I.], vaulted, arched.

  1. I. Lit.: paries vel solidus vel fornicatus, Cic. Top. 4, 22: ambitus, Plin. 12, 5, 11, § 22.
  2. II. As an adj. prop.: Via Fornicata, or Arch Street, a street in Rome leading to the Campus Martius, Liv. 22, 36, 8.