Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Vesbĭus, i, v. Vesuvius.
Vĕsŭvĭus, ii, m. [ve and σβε-, root of σβέννυμι; v. Lidd. and Scott s. v.], a celebrated volcano in Campania, Liv. 8, 8, 19; Mel. 2, 4, 9; Plin. 14, 2, 4, § 22; Col. 3, 2, 10; Plin. Ep. 6, 6, 12.
Collat. form Vĕsēvus (Vĕsaev-), i, m., Suet. Tit. 8; id. Vit. Plin.; Stat. S. 4, 8, 5; Val. Fl. 4, 507.
In apposition: Vesevo jugo, Verg. G. 2, 224 (Rib. Vesaevo); Claud. Rapt. Pros. 3, 184.
Contr. collat. form Vesvĭus or Vesbĭus, ii, m., Mart. 4, 44, 1; Stat. S. 4, 4, 79; Sil. 8, 655; 17, 598; Val. Fl. 3, 209.
Hence, Vĕsŭvī-nus, a, um, adj., of or belonging to Vesuvius, Vesuvian: apex, Stat. S. 3, 5, 72: incendia, id. ib. 2, 6, 62; 5, 3, 205.
Collat. form Vĕsēvīnus, a, um: aquae, Cael. Aur. Tard. 2, 1.
Contr. Vesbīnus, Sil. 12, 152.