round arch

noun
an arch formed in a continuous curve, especially in a semicircle.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To round arch
Example sentences
The bridge also features concrete railings with round arch balustrades.
These take the shape of a long round arch, with its path high above, and its
  two ends apparently beyond the horizon.
The shape and depth of the round arch below that triangle, also argues against
  anything but a traditional outlook by the builders.
The windows are linked by string courses and are in a round arch form.
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