A / Amp-sanctus
noun

Amp-sanctus

gen. Amp-sancti · gender masculine · decl. 2nd
(better than )
a lake in Italy; highly dangerous from its pestiferous exhalations; Le Mofete
a lake in Italy, highly dangerous from its pestiferous exhalations (hence, in the poets, the entrance to the infernal regions), now Le Mofete or Lago d' Ansante, Verg. A. 7, 565; Cic. Div. 1, 36; Plin. 2, 93, 95, § 208.