Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Vectōnes or Vettōnes, um, m., a people of Lusitania, in the modern Salamanca and Estremadura, Plin. 3, 3, 4, § 19; 4, 20, 34, § 112; Caes. B. C. 1, 38; Liv 35, 22, 8; Luc. 4, 9; Sil. 3, 378.
Hence, Vet-tōnĭa, ae, f., the territory of the Vettones, Prud. στεφ. 3, 187; Inscr. Grut. 383, 7.