Definition from Wiktionary, the free dictionary
See also Lyonnaise
lyonnaise (not comparable)
- Cooked with onions, especially caramelized onions.
- For dinner, we had beef with potatoes lyonnaise.
- Prepared in a style typical to Lyons.
- The essential ingredients of salad lyonnaise are bacon, croutons and poached egg.
Usage notes 
Unlike most English adjectives, lyonnaise typically follows the noun that it describes.
in a style typical to Lyons
See also 
- feminine form of lyonnais