cupola

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cupola.
1. Bowl-shaped vault on a circular, elliptical, or polygonal plan.

2. Underside or soffit of a dome.

3. Bowl-shaped element carried on columns set as a canopy over a tomb, etc., or a ciborium.

4. Small dome on the lantern over the eye of a large dome, or the dome plus lantern, or any diminutive domed form, visible above a roof.

5. Revolving dome of an observatory, or an armoured revolving dome over the guns of a fortress.

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