dun

Dun is a generic term for an ancient or medieval fort. It is mainly used in the British Isles to describe a kind of hill fort and also a kind of Atlantic roundhouse. The term comes from Irish dún or Scottish Gaelic dùn (meaning "fort"), and is cognate with Old Welsh din, whence Welsh dinas (meaning "city") comes.

The Dün is a hill chain in northwestern Thuringia, Germany. It runs west to east, and forms the northwestern edge of the Thuringian Basin. It separates the Thuringian Basin from the upper valley of the river Leine. Towards the east it continues in the Hainleite ridge. The highest point, 522 m above sea level, is near the village Vollenborn.

A dun is a type of fort.

Michel Félix Dunal (24 October 1789 Montpellier – 29 July 1856 Montpellier) was a French botanist. He was a professor of botany in Montpellier, France.