Source : Webster's Revised Unabridged Dictionary (1913)

Arcadian \Ar*ca"di*an\, Arcadic \Ar*ca"dic\, a. [L. Arcadius,
   Arcadicus, fr. Arcadia: cf. F. Arcadien, Arcadique.]
   Of or pertaining to Arcadia; pastoral; ideally rural; as,
   Arcadian simplicity or scenery.

Source : WordNet®

Arcadic
     n : the dialect of Ancient Greek spoken by Arcadians