Arch stone

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Arch´ stone`

1.A wedge-shaped stone used in an arch; a voussoir.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
The river is marked by classic arch stone bridges that create a perfect circle with their reflection in the water.
Arched roof trusses take pride of place in kitchens, arch windows are distinctive features in many rooms and arch stone doorways provide a grand and historic entrance for the more modest modern abode.
Add thin wedges of stone as needed so that each arch stone (called a voussoir) fits snugly into the structure.