Entry 2 senses · 2 variants Webster, 1913 Zoroastrian · Zo·ro·as·tri·an · IPA /ˌzoʊɹ.oʊˈæs.tɹi.ən/ a. n. 01 a. Of or pertaining to Zoroaster, or his religious system. 1. Of or pertaining to Zoroaster, or his religious system. 02 n. A follower of Zoroaster; one who accepts Zoroastrianism. 1. A follower of Zoroaster; one who accepts Zoroastrianism.