Lewis & Short

Vercellae, ārum, f., a town in Gallia Cisalpina, now Borgo Vercelli, Plin. 3, 17, 21, § 124; Brut. ap. Cic. Fam. 11, 19, 2; Tac. H. 1, 70.
Hence,

  1. A. Vercellensis, e, adj., of or belonging to Vercellœ: ager, Plin. 33, 4, 21, § 78.
  2. B. ‡ Vercellīnus, a, um, adj., of Vercellœ, Vercelline: PORTA, Inscr. Marin. Fratr. Arv. p. 772.