A city in Northern Ireland, also known as Londonderry. The name can also refer to a small valley or glen in Irish topography.
From Irish Gaelic 'Daire' meaning 'oak grove' or 'oak wood,' derived from 'dair' (oak tree). The city was originally called Daire Calgaich (Calgach's oak grove) after a chieftain. The 'London' prefix was added in 1613 when the city was granted to London guilds.
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