zidina

1. (usually plural) ramparts; city walls
   Šetali smo pored zidina Beogradske tvrđave. — We walked along the walls of Belgrade Fortress.
   Stari grad je okružen visokim zidinama. — The old town is surrounded by high walls.
2. (usually plural) ruins
   Od manastira su ostale samo zidine. — Only the ruins of the monastery remain.

Mostly used in the plural: zidine.