Dome (noun)

1. A rounded roof or vault, typically forming the roof of a building or structure.
2. A large hemispherical roof or ceiling.

Origin:

Late 16th century: from french, from italian domo, from latin domus "house".

Examples:

1. The cathedral was famous for its impressive dome, which was covered in gold.
2. The stadium was designed with a retractable dome to protect the playing field from the elements.
3. The museum featured a beautiful glass dome that allowed natural light to flood the interior.
4. The rotunda of the Capitol building was topped by a magnificent dome.
5. The city was famous for its domed concert hall, where classical music performances were held.