Pars UK /pɑːs/US /pɑɹs/ noun1 •A province and historical region in southwestern Iran, homeland of the Persians; known to the ancient Greeks as Περσίς (Persís) or Περσική (Persikḗ), to the Romans as Persis or Persia, and to the Arabs as فَارِس (fāris).PARS, Fars or Farsistan, is a province of the kingdom of Persia which gives its name to the country. — 1873