Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

Raurăci (Raurĭci, Plin. 4, 17, 31, § 106), ōrum, m., a people of Gaul, on the Rhine, neighbors of the Helvetians, near Basle, Caes. B. G. 1, 5; 6, 25; 7, 75.
Hence,

    1. 1. Raurăcum, i, n., the city of the Rauraci, now Augst, near Basle, Amm. 14, 10, 6: Rauriaca colonia, Plin. l. l.; also called Raurĭcum, id. 4, 12, 24, § 79: RAVRICA, Inscr. Orell. 432.
    2. 2. Raurăcus, a, um, adj., of or belonging to the Rauraci: colonia Rauraca = Rauracum, Plin. 4, 17, 31, § 106 (al. Rauriaca).