society > leisure > the arts > visual arts > architecture > arch > 			[noun]		 > dome or cupola > specific part (3)		
A circular plate or cylindrical ring of timber or iron round the edge of any circular structure (usually to hold it firmly together): (a) a…
A curvilinear wall-plate at the springing of a dome, etc.; = curb, n. 9(a) 8b; also, the plate or frame round the mouth of a well, etc.; the…
Architecture. A round exterior building surrounding the base of a dome or cupola; also the circular vertical part of a cupola.