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flat arch

noun, Architecture
an arch having a more or less flat intrados and extrados with voussoirs radiating from a center below the arch.
Also called jack arch.
Origin of flat arch
1705-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for flat arch
  • The windows are the size of its doorways, all of which are topped with a flat arch.
  • They are flanked by pink gneiss and granite, and the grouping appears to be deliberate, the whole forming a decorative flat arch.
  • Above and north of the latter window is an opening for power lines with a lug sill and flat arch.
  • Its ashlar framing is severe, except for a raised keystone and flanking voussoirs at the center top of the flat arch.
  • The flat arch with keystone was incised and filled in with cement in the nineteenth century.

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