Source : Webster's Revised Unabridged Dictionary (1913)

Purgatorial \Pur`ga*to"ri*al\, Purgatorian \Pur`ga*to"ri*an\, a.
   Of or pertaining to purgatory; expiatory.

Source : WordNet®

purgatorial
     adj 1: serving to purge or rid of sin; "purgatorial rites" [syn: {purging},
             {purifying}]
     2: of or resembling purgatory; "purgatorial fires"