1. A person who shows or reveals sacred things: A hierophant is an interpreter of sacred mysteries or esoteric principles, a mystagogue.<

Mr. Timmons, a hierophant, defined and explained obscure and mysterious matters in his new book, especially about sacred doctrines or mysteries.
2. The presiding priest who initiated candidates at the Eleusinian mysteries: The hierophant is also the, one who teaches the mysteries and duties of religion.

In ancient Greece, a hierophant was an official expounder of rites of worship and sacrifice.