Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sīda, ae (collat. form Sīdē, ēs, Plin. 5, 27, 26, § 96), f., = Σίδη, a town in Pamphylia, now Eski Adalia, Mel. 1, 14 sq.; Cic. Fam. 3, 6, 1; 3, 12, 4; 12, 15, 5; Liv. 35, 13; 37, 23 al.
Hence, Sīdētae, ārum, m., = Σιδῆται, the inhabitants of Sida, Liv. 35, 48, 6 Drak. N. cr.