Source : Webster's Revised Unabridged Dictionary (1913)

Avesta \A*ves"ta\, n.
   The Zoroastrian scriptures. See {Zend-Avesta}.

Source : WordNet®

Avesta
     n : a collection of Zoroastrian texts gathered during the 4th or
         6th centuries [syn: {Zend-Avesta}]