keystone arch

Any arch having a keystone at its center, but commonly a flat arch or a round-topped arch.

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flat keystone arch

References in periodicals archive ?

The finishing touches were made to the battlements on Thursday (February 28) and deputy head teacher, Mr Tim Lewis was particularly impressed by the use of the keystone arch.

Snow in Surrey: Bagshot school pupils build impressive snow fort after sports lesson is cancelled amid freezing temperatures; Sports class may have been cancelled but that didn't stop Hall Grove School students from having fun in the snow

BECKET- CHESTER- MIDDLEFIELD- REHABILITATION OF B-03-017=M-19-017 & B-03-018=M-19-018, OLD "WESTERN RAILROAD" KEYSTONE ARCH BRIDGES OVER THE WESTERN BRANCH OF WESTFIELD RIVER

Becket- Chester- Middlefield- Rehabilitation Of B-03-017=M-19-017 & B-03-018=M-19-018, Old "WESTERN Railroad" Keystone Arch Bridges Over The Western Branch Of Westfield River

3) This keystone arch at the Upper Barton Mill site once topped the channel that let water flow from the power wheel back to the French River.