noun / verb
dome
DOHM/dəʊm/
A rounded structure forming a roof or cap.
A smooth dome forms the roof of the circular building.

Etymology
The word for a house or housetop narrowed to a particular roof shape. The rounded cupolas characteristic of Italian cathedrals helped establish the English architectural meaning.
In context
the wall is coming in like this, they're building it up more and more narrowly. So it might have come to a sort of dome shape on top.
More examples
- A glass dome covers the cake on the counter.
- The museum has a high, domed ceiling.
- The dough domes above the rim of the pan.
Forms
dome · domes · domed · doming
Similar words
- cupola
- Usually a small rounded structure perched on a larger roof.
- vault
- An arched roof or ceiling, not necessarily hemispherical.