A domelike structure surmounting a roof or dome, often used as a lookout or to admit light and air.
A geodesic dome.
The definition of a building is a structure or the process of making a structure.
Find another word for rotunda. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for rotunda, like: dome, portico, cupola, quadrangle, stained-glass-window, glass-and-steel, arcade and building.