An onion dome (Russian: луковичная глава, lúkovichnaya glava) is a type of architectural dome usually associated with Russian Orthodox churches. Such a dome is larger in diameter than the drum it is set upon and its height usually exceeds its width. These bulbous structures taper smoothly to a point, and strongly resemble the onion, after which they are named.
Other important types of Orthodox cupolas are antique helmet domes (for example, those of the Saint Sophia Cathedral in Novgorod and Assumption Cathedral in Vladimir), Ukrainian pear domes (Saint Sophia Cathedral in Kiev), and Baroque bud domes (St. Andrew's Church in Kiev). (more....)