NOUN (2)

1. a native or inhabitant of Parthia;

2. the Iranian language spoken in the Parthian kingdom (250 BC to AD 226);


ADJECTIVE (1)

1. pertaining to Parthia or its people or language or culture;
- Example: "Parthian archeology"

The Collaborative International Dictionary of English v.0.48:

Parthian \Par"thi*an\, a.
   Of or pertaining to ancient Parthia, in Asia. -- n. A native
   of Parthia.
   [1913 Webster]

   Parthian arrow, an arrow discharged at an enemy when
      retreating from him, as was the custom of the ancient
      Parthians; hence, a parting shot.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Parthian
    adj 1: pertaining to Parthia or its people or language or
           culture; "Parthian archeology"
    n 1: a native or inhabitant of Parthia
    2: the Iranian language spoken in the Parthian kingdom (250 BC
       to AD 226)