Definition of castle noun from the Oxford Advanced American Dictionary

     

    castle

     noun
    noun
    NAmE//ˈkæsl//
     
     
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  1. 1a large strong building with thick high walls and towers, built in the past by kings or queens, or other important people, to defend themselves against attack Windsor Castle a medieval castle see also sandcastle
  2. 2(also rook) (in chess) any of the four pieces placed in the corner squares of the board at the start of the game, usually made to look like a castle
  3. Idioms
    (build) castles in the air
     
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    (to have) plans or dreams that are not likely to happen or come true As a child he would wander around the docks, building castles in the air about owning a boat one day.
    a man's home is his castle(saying)
     
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    a person's home is a place where they can be private and safe and do as they like
See the Oxford Advanced Learner's Dictionary entry: castle