Akademik

round arch
noun
an arch formed in a continuous curve; characteristic of Roman architecture
Hypernyms: ↑arch
Hyponyms:
bell arch, ↑Moorish arch, ↑horseshoe arch, ↑Roman arch, ↑semicircular arch, ↑three-centered arch, ↑basket-handle arch

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an arch formed in a continuous curve, esp. in a semicircle.
[1830-40]

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round arch,
a semicircular arch.

Useful english dictionary. 2012.