Lewis & Short

Tŭder, ĕris, n., a town in Umbria, near the Tiber, now Todi, Plin. 3, 14, 19, § 113; Sil. 6, 645.
Hence,

  1. A. Tŭders, ertis, adj. m., of or belonging to Tuder; as subst., an inhabitant of Tuder, Sil. 4, 222; 8, 464; Inscr. Orell. 1228 and 3726.
  2. B. Tŭder-nis, is, adj. f., of or belonging to Tuder: vitis, Plin. 14, 3, 4, § 36.