Source : Webster's Revised Unabridged Dictionary (1913)

Mystagogue \Mys"ta*gogue\, n. [L. mystagogus, Gr. ?; ? one
   initiated in mysteries + ? leading, n., a leader, fr. ? to
   lead: cf. F. mystagogue. See 1st {Mystery}.]
   1. interprets mysteries, especially of a religious kind.

   2. One who keeps and shows church relics.