Lewis & Short

Scaea porta, ae, f., = Σκαιαὶ πύλαι, the Scœan (western, σκαιός) gate of Troy; Verg. A. 3, 351; Sil. 13, 73; also, acc. to the Greek, in the plur.: Scaeae portae, Verg. A. 2, 612.
As subst.: Scaeae, the Scœan gate: Astyanax Scaeis dejectus ab altis, Aus. Epit. Her. 15, 3.