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.

Trăsŭmēnus (also Trăsymēnus, after Τρασυμένη λίμνη, in Strabo; and less correctly Trăsĭmēnus), Trasimenus lacus, or simply Trasimenus, Τρασιμένη λίμνη, a lake in Etruria, near Perusia, celebrated for Hannibal’s victory over the Romans, now Lago Trasimeno or Lago di Perugia, Cic. Div. 2, 8, 21; id. N. D. 2, 3, 8; id. Rosc. Am. 32, 89; id. Brut. 14, 57; Liv. 22, 4 sq.; Flor. 2, 6, 13; Val. Max. 1, 6, 6; Sil. 4, 739; 5, 8; Stat. S. 1, 4, 86; Plin. 2, 84, 86, § 200; 2, 107, 111, § 241; 7, 28, 29, § 106.
As adj.: Trasimena litora, Ov. F. 6, 765.
Hence, Trăsĭmēnĭcus, a, um, adj., of or belonging to Trasimenus, Trasimenian: strages, Sid. Carm. 9, 247.