pen·i·ten·tial /ˌpɛnəˈtɛn(t)ʃəl/
 (a.)後悔的,懺悔的,贖罪的悔罪規則書


 Pen·i·ten·tial a.  Of or pertaining to penitence, or to penance; expressing penitence; of the nature of penance; as, the penitential book; penitential tears. “Penitential stripes.”
    Guilt that all the penitential fires of hereafter can not cleanse.   --Sir W. Scott.


 Pen·i·ten·tial, n. R. C. Ch. A book formerly used by priests hearing confessions, containing rules for the imposition of penances; -- called also penitential book.

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 penitential
      adj 1: of or relating to penitence or penance; "the Day of
             Atonement is the great penitential day of the Hebrew
             calendar"
      2: showing or constituting penance; "penitential tears"; "wrote
         a penitential letter apologizing for her hasty words"