Easy The central stone at the summit of an arch, locking the other stones in place and crucial to the structure's stability. Clear All
3 Example Sentences Showcasing the Meaning of 'Keystone'
The construction crew carefully placed the keystone, ensuring the stability of the ancient aqueduct.
Sarah's science project on ancient structures highlighted the importance of the keystone in Roman arches.
The wilderness guide identified navigation skills as the keystone for a safe and enjoyable outdoor adventure.
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