Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Vesĕris, is, m., a river in Campania, with a town of the same name, Cic. Off. 3, 31, 112; id. Fin. 1, 7, 23; Liv. 8, 8; 10, 28; Val. Max. 6, 4, 1; Aur. Vict. Vir. Ill. 26, 4; 28, 4.