GNU Collaborative International Dictionary of English

Found 2 definitions

1.       
   Zarathustra  (?), Zarathuster (?), prop. n. The Persian name for Zoroaster.
   
   [PJC]
   
   
         
       

2.       
   Zoroaster (?), prop. n. The persian prophet Zarathustra, who probably lived in the second millenium B. C.  His treachings form the basis for the religion Zoroastrianism.
   
   [PJC]