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keystoneKE'YSTONE, n. The stone on the top or middle of an arch or vault, which being wider at the top than at the bottom, enters like a wedge and binds the work; properly, the fastening-stone. |
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keystoneKE'YSTONE, n. The stone on the top or middle of an arch or vault, which being wider at the top than at the bottom, enters like a wedge and binds the work; properly, the fastening-stone. |