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Yezdegerdian
Yezdegerdian Yez`de*ger"di*an (?; 277), a.
Of or pertaining to Yezdegerd, the last Sassanian monarch of
Persia, who was overthrown by the Mohammedans; as, the
Yezdegerdian era, which began on the 16th of June, a. d. 632.
The era is still used by the Parsees.
Meaning of Yezdegerdian from wikipedia