Thermŏpўlae

ārum, f.
I. the famous defile of Œta, where Leonidas fell, Mel. 2, 3, 6: saltus Thermopylarum, Liv. 36, 15, 5; 37, 58, 7; Cic. Off. 1, 18, 61; id. Tusc. 1, 42, 101; id. Sen. 10, 32; id. Fin. 2, 30, 97; Just. 2, 11, 2; Cat. 68, 54; Flor. 2, 8, 11; Nep. Them. 3, 4.
Lewis & Short
A Latin Dictionary, 1879
An open-access project