arch-stone

Definitions

noun A wedge-shaped stone used in the construction of an arch; a voussoir. See cut under arch.
noun 2. A flat stone by which the opening into the chamber of some furnaces is covered.

Sorry, no etymologies found.

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And hung o'er each arch-stone a crown and a shield;

Stories of the Border Marches Jeanie Lang
The ruinous little chapel in the corner, whose walls a quarter of a century before I had distinctly traced, had sunk into a green mound; and there remained over the sward but the arch-stone of a Gothic window, with a portion of the moulded transom attached, to indicate the character and style of the vanished building.

The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland Hugh Miller 1829