piaculum

Noun

 * 1) An expiatory sacrifice.
 * 2) The victim in such a sacrifice.
 * 3) An act requiring expiation.

Etymology
From.

Noun

 * 1) propitiatory sacrifice
 * 2) an animal offered up in sacrifice, a victim
 * 3) sin, crime, guilt
 * 1) sin, crime, guilt