| 1. | Architecture.
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| 2. | any overhead curvature resembling an arch. |
| 3. | something bowed or curved; any bowlike part: the arch of the foot. |
| 4. | a device inserted in or built into shoes for supporting the arch of the foot. |
| 5. | a dam construction having the form of a barrel vault running vertically with its convex face toward the impounded water. |
| 6. | Glassmaking.
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| 7. | to cover with a vault, or span with an arch: the rude bridge that arched the flood. |
| 8. | to throw or make into the shape of an arch or vault; curve: The horse arched its neck. |
| 9. | to form an arch: elms arching over the road. |
| 10. | Nautical. hog (def. 14). |
In architecture, a curved or pointed opening that spans a doorway, window, or other space.
Note: The form of arch used in building often serves to distinguish styles of architecture from one another. For example, Romanesque architecture usually employs a round arch, and Gothic architecture, a pointed arch.
arch (ärch)
n.
An organ or structure having a curved or bowlike appearance, especially either of two arched sections of the bony structure of the foot.