Kasnak ya da tambur, bir binada kubbenin yükseldiği, silindirik ya da çokgen prizma şeklindeki üst kısımdır.[1]
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Kingston_City_Hall_in_2007.jpg/640px-Kingston_City_Hall_in_2007.jpg)
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