One who prepares candidates for initiation into a mystery cult.
One who holds or spreads mystical doctrines.
[From Latin mystagōgus, from Greek mustagōgos : mustēs, an initiate; see mystery1 + agōgos, guide, leader (from agein, to lead; see ag- in Indo-European roots).] mys'ta·gog'ic (-gŏj'ĭk) adj., mys'ta·go'gy (-gō'jē) n.
"person who initiates into mysteries," c.1550, from Gk. mystes "one initiated into the mysteries" (see mystery) + agogos "leading, a leader" (see act).