Properly, the translation and exposition in the Huzvâresh, or literary Pehlevi, language, of the Avesta, the Zoroastrian sacred writings; as commonly used, the language (an ancient Persian dialect) in which the Avesta is written
zend
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[ "zend-&-'ves-t& ] (noun.) 1630. French, from Middle Persian AvastAk va Zand Avesta and commentary.