The Collaborative International Dictionary of English v.0.48:
Purgatorial \Pur`ga*to"ri*al\, Purgatorian \Pur`ga*to"ri*an\, a. Of or pertaining to purgatory; expiatory. [1913 Webster]WordNet (r) 3.0 (2006):
purgatorial adj 1: serving to purge or rid of sin; "purgatorial rites" [syn: purgatorial, purging, purifying] 2: of or resembling purgatory; "purgatorial fires"