Longman Dictionary of Contemporary English homepage

Topic: BUILDINGS

Date: 1000-1100
Language: Old North French
Origin: castel, from Latin castellum 'building with a defensive wall', from castrum 'defended place, camp'

castle

noun
     
castle
cas‧tle W3 [countable]
1TBB also Castle a very large strong building, built in the past as a safe place that could be easily defended against attack:
Edinburgh Castle
a ruined castle
2DGB one of the pieces used in a game of chess. Each player has two castles, which start the game in the corner squares, and can move only forwards or sideways [= rook]
3

castles in the air

plans or hopes that you have that are unlikely ever to become real
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