Lewis & Short

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.