noun
a medieval fortified structure, typically with high walls and towers, that was used as a residence or stronghold
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The medieval castle, or castell in Catalan, was a magnificent structure that stood the test of time.
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We're going to visit the old castell ruins on our trip to Spain.
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Let's sneak into the abandoned castell and see if we can find any treasure!
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Her mind was like a fortified castell, impenetrable to outside influences.