Definition of "au" []

• A common English digraph representing generally the sound of “broad a” (â), but often also ä. (noun)
• To the; at the; with the: the dative of the French definite article, occurring in some phrases frequently used in English, as au fait, au fond, au revoir, etc. (noun)
• The chemical symbol of gold (L., aurum). (noun)

The Century Dictionary (Public Domain)

• "Even the churned foam from a paddle wheel is _café au lait_ with what a blue-jacket contemptuously referred to as "a little more of the _au lait!"
• "They have real food, you can order a large latte without beeing sneered at, and the pain au chocolat is not the best I have had, but it is in the top three."
• "These pastries include things like croissants, Danishes, pain au chocolate (both often made with croissant dough)."