In Greek mythology, a woman participant in the orgiastic rites of Dionysus (6)
I believe the answer is:
maenad
(Other definitions for maenad that I've seen before include "Female votary of Dionysus or a wild woman" , "Woman possessed" , "A raging woman, once a follower or Dionysus" , "Female fan of Bacchus" , "Wild female follower of Dionysus" .)