Definition of roussillon:
(n) :
A region of the Occitania region, France, approximately coterminous with Pyrénées-Orientales, that was once a part of Catalonia.
(n) :
A commune in Vaucluse department, Provence-Alpes-Côte d'Azur, France.
(n) :
A commune in Isère department, Auvergne-Rhône-Alpes, France.
(n) :
A regional county municipality in Montérégie, Quebec, Canada.
(n) :
A surname from French.