Where does “Zoroastrianism” come from?

Zoroastrianism is an English formation from Zoroastrian, derived through Latin -ianus and -ius suffixes from Proto-Indo-European -yós via Proto-Italic -os.

Zoroastrianism (English): Mazdaism, the surviving form of the indigenous (pre-Islamic) Iranian ethnic religion

Definitions

  1. Mazdaism, the surviving form of the indigenous (pre-Islamic) Iranian ethnic religion

Ancestry of “Zoroastrianism”, step by step

StepLanguageWordMeaning
1EnglishZoroastriana follower of Zoroastrianism; relating to or...
2LatinZōroastrēsZarathustra; Zoroaster founder of Zoroastrianism
3Ancient GreekΖωροάστρηςZarathustra; Zoroaster
4Avestan𐬰𐬀𐬭𐬀𐬚𐬎𐬱𐬙𐬭𐬀Zoroaster
Every word from Avestan 𐬰𐬀𐬭𐬀𐬚𐬎𐬱𐬙𐬭𐬀Every word from Ancient Greek ΖωροάστρηςEvery word from Latin Zōroastrēs