1. lyonnaise - Adjective
2. lyonnaise - Adjective Satellite
Applied to boiled potatoes cut into small pieces and heated in oil or butter. They are usually flavored with onion and parsley.
Source: Webster's dictionaryPan-fried potato dishes include crisp potato pancakes like latkes and rosti, Lyonnaise potatoes fragrant with onion, hash browns and other classics. Source: Internet