Lewis & Short

Flāvīna, ae, f., a small city of Etruria, Sil. 8, 492; called also Flāvīnĭum, i, n., Serv. Verg. A. 7, 698.
Hence, Flāvīnĭ-us, a, um, adj., Flavinian: arva, Verg. A. 7, 696 Serv.