0 a part at the top of a tower or building that is round in the middle and has a point at the top, similar in shape to an onion: --
The central tower rises 63 metres (about 20 storeys) and is topped by a gold onion dome.
Its design includes an enclosed bell tower and a small onion dome.
The exterior has a -tall tower, topped with a drum surrounded by eight columns, with an onion dome and cross on the very top.
The tower originally had a spire on a low onion dome, but at a renovation in 1880 the tower got its current design.
The tower was retained and topped with an onion dome.
In 1659, a clocktower was built on the east bastion; its pointed roof was replaced in 1760 with an onion dome.
The central dome is formed in an octahedral shape with a splayed roof, instead of an onion dome.
By that time the onion dome design was also fully developed.
