Lewis & Short

Octōdūrus, i, m.,

  1. I. a town of the Veragri, in Gallia Narbonensis, the modern Martigny, Caes. B. G. 3, 1.
    Hence,
  2. II. Octō-dūrensis, e, adj., of or belonging to Octodurus; in plur.: Octōdūrenses, ĭum, m., the inhabitants of Octodurus, the Octodurians, Plin. 3, 20, 24, § 135.