Lewis Short
lŭpānar (noun N) : lupa, II. A.
* A house of ill-repute: qui in lupanari accubat,Plaut. Bacch. 3, 3, 50: deprehensus in lupanari cum alienā uxore,Quint. 7, 3, 6: intrare,Juv. 6, 121: virorum, Mos. et Rom. Leg. Coll. 5, 3, 2.—As a term of reproach: O lutum, lupanar, aut si perditius potest quid esse,Cat. 42, 13.
Charlton T. Lewis, Charles Short, A Latin Dictionary