• (a.) Pertaining to the ancient Rhaeti, or Rhaetians, or to Rhaetia, their country; as, the Rhetian Alps, now the country of Tyrol and the Grisons.
Rhe'ti·an adjective [ Latin Rhaetius , Raetius : confer French rhétien .] Pertaining to the ancient Rhæti, or Rhætians, or to Rhætia, their country; as, the Rhetian Alps, now the country of Tyrol and the Grisons.