Penitential

Part of speech: noun (n.)

A book formerly used by priests hearing confessions, containing rules for the imposition of penances; -- called also penitential book.

Part of speech: adjective (a.)

Of or pertaining to penitence, or to penance; expressing penitence; of the nature of penance; as, the penitential book; penitential tears. "Penitential stripes." Cowper. Guilt that all the penitential fires of hereafter can not cleanse. Sir W. Scott.