noun
fortified city; walled city
Refers to a city surrounded by defensive walls or fortifications, often in historical contexts.
ヨーロッパには中世の城郭都市が多く残っている。
Many medieval walled cities remain in Europe.
城下町 is a castle town that developed around a feudal lord's castle, not necessarily fully walled; 城郭都市 emphasizes the defensive walls themselves.
Compound of 城郭 (fortress, castle walls) and 都市 (city).