myster-, myst-

(Greek > Latin: secret, occult [probable literal meaning is "one whose eyes are closed"])

mystagogic (adjective), more mystagogic, most mystagogic
Pertaining to a mystagogue or mystagogy; relating to instruction in mysteries: Jack was interested in mystagogic doctrines, principles, and interpretations of mysteries and had many books on this topic.
mystagogue (s) (noun), mystagogues (pl)
1. In Ancient Greece, one who gave preparatory instruction to candidates for the initiation into the Eleusinian or other mysteries; a hierophant: A mystagogue was one who introduced someone to religious mysteries, or was a teacher of mystical doctrines.
2. One who keeps church relics and presents them to the public: The priest was a mystagogue who had a great collection of church antiquities that were on display in a show case for interested people to view.
mystagogy (s) (noun), mystagogies (pl)
The interpretation of mysteries; the convictions, principles and practice of a mystagogue: Tom wanted to learn more about mystagogy and decided to ask a mystagogue to teach him about this exciting field of knowledge.

A cross reference of other word family units that are related directly, or indirectly, to: "secret, hidden, confidential, concealed": ceal-; clandesti-; crypto-; occult-; orgy-; stego-, stegano-.