DictionarycastleFortified building
noun

castle

KAS-uhl/ˈkæsl/

A fortified residence with defensive walls and towers.

Thick stone walls and towers surround the castle's guarded entrance.

An isolated stone castle shows thick fortified walls, towers and a gatehouse, with a minimal ground base; no fantasy spires.
Etymology

Latin castellum was a diminutive of castrum, “fort.” The modern meaning preserves the defensive purpose: a castle is not merely a grand building but a fortified stronghold.

In context

HistoryExtra0:12
to survive life in any medieval castle the first thing you need is walls often several feet thick they were the first line of defense against Invaders
What Was Life REALLY like in a Medieval Castle? | The Truth About Castle Living

More examples

  • The medieval castle overlooks the river.
  • Visitors cross a bridge to enter the castle.
  • He moves his castle, the rook, along the open file.

Forms

castle · castles

Similar words

fortress
Emphasizes military defense rather than residence.
palace
Emphasizes a grand residence without necessarily defensive fortifications.