Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Perseus.
The word Thermopylæ could not be parsed. Trying a normal dictionary lookup:
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Thermŏpylae, ārum, f., = Θερμοπύλαι, 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.