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Webster 1913 Edition

Noun.

[L.

piaculum

a propitiatory sacrifice, that which requires expiation, a wicked action, fr.

piare

to appease, to expiate,

pius

pious.]

A heinous offense which requires expiation.

[R.]

Howell.

Noun.

[L. piaculum.] An enormous crime. [Not used.]

piacle ‎(plural piacles)