an ancient country in W Asia, SE of the Caspian Sea: conquered by the Persians a.d. 226; now a part of NE Iran.
British Dictionary definitions for Parthia
Parthia
/ˈpɑːθɪə/
noun
1.
a country in ancient Asia, southeast of the Caspian Sea, that expanded into a great empire dominating SW Asia in the 2nd century bc It was destroyed by the Sassanids in the 3rd century ad