the script in which the ancient Persian language of the Avesta is written
<noun.communication> [ adj ]
of or pertaining to the Avesta (sacred text of Zoroastrianism)
<adj.pert>
Avestan \A*ves"tan\, a. Of or pertaining to the Avesta or the language of the Avesta. -- n. The language of the Avesta (an ancient Iranian language); -- less properly called {Zend}.