adjective (a)

• serving to purge or rid of sin(adj.pert)

  Example:
  Purgatorial rites.
  

  Synonym:
  purging, purifying
  

  source: wordnet30
• of or resembling purgatory(adj.pert)

  Example:
  Purgatorial fires.
  

  source: wordnet30
• Of or pertaining to purgatory; expiatory.(adjective)

  source: webster1913