flat arch

noun Architecture.
an arch having a more or less flat intrados and extrados with voussoirs radiating from a center below the arch. See illus. under arch.
Also called jack arch.


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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The windows are the size of its doorways, all of which are topped with a flat
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.
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