Definition of "Dun"

A river in Wiltshire and Berkshire, England, which flows into the River Kennet.  examples

A river in Wiltshire and Hampshire, England, which flows into the River Test.  examples

An alternative name for the River Don in Yorkshire, England.  examples

A river in County Antrim, Northern Ireland, alternatively named the Glendun River.  examples

A settlement and parish in Angus council area, Scotland (OS grid ref NO6659).  examples