The Scottish form of old.
Auld Alliance an informal term for the political relationship of France and Scotland between the 14th and the 16th century.
Auld lang syne a Scottish phrase meaning times long past. The phrase was popularized as the title and refrain of a song by Robert Burns (1788), now traditionally sung on New Year's Eve.
Auld Reekie an informal name for Edinburgh, recorded from the early 19th century and meaning literally ‘Old Smoky’.