adjective
of, from or relating to the city of Clermont-Ferrand, the prefecture of the Puy-de-Dôme department, Auvergne-Rhône-Alpes, France; of, from or relating to the town of Clermont, Oise department, Hauts-de-France, France; Clermont, Ariège department, Occitania; Clermont, Haute-Savoie department, Auvergne-Rhône-Alpes; or Clermont, Landes department, Nouvelle-Aquitaine
From Clermont + -ois.