Ar·sa·cid 
(ärsə-sĭd, är-sā-)
(ärsə-sĭd, är-sā-)adj.
Of or relating to the Parthian dynasty that ruled Persia and parts of Asia Minor from c. 250 BC until its overthrow in AD 224.
n.
A member or subject of this dynasty.
[After Arsaces (fl. 250 BC), founder of the dynasty.]