Wikipedia
A vennel is a passageway between the gables of two buildings which can in effect be a minor street in Scotland and the north east of England, particularly in the old centre of Durham. In Scotland, the term originated in royal burghs created in the twelfth century, the word deriving from the Old French word venelle meaning "alley" or "lane". Unlike a tenement entry to private property, known as a "close", a vennel was a public way leading from a typical high street to the open ground beyond the burgage plots. The Latin form is venella, related to the English word "funnel".
The Scottish burghs established by David I (see Economy section of Scotland in the High Middle Ages) drew upon the burgh model of Newcastle-upon-Tyne and used a number of French or Germanic words for townscape features. Aberdeen City Council refers to vennels having been part of the old town and historical records suggest Arbroath had a vennel. In the City of Durham, like Newcastle, part of the old kingdom of Northumbria, lanes are also known colloquially as vennels.
There are vennels in Ardersier, Cromarty, Culross, Dalry, Dumfries, Edinburgh, Elie, Eyemouth, Forfar, Irvine, Lanark, Linlithgow, North Berwick, Peebles, South Queensferry, Stirling and Wigtown. There are also vennels in the towns of Glenarm and Bangor in Northern Ireland, likely reflecting the Scottish influence in the Northern Irish province of Ulster.
The city of Perth has lost many vennels with the gradual transformation of its medieval centre, but some have survived and are still used: Guard Vennel, Cow Vennel, Baxters Vennel, Fleshers Vennel, Water Vennel and Cutlog Vennel.
The Vennel off the Grassmarket in Edinburgh appears in the film 'The Prime of Miss Jean Brodie' (1969) when Brodie takes her girls on a walk through the Old Town, ending up in Greyfriars Kirkyard.