Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
Filicide
Filicide is the deliberate act of a parent killing his or her own child. The word "filicide" is derived from the Latin words "filius" and "filia" (son and daughter) and the suffix "-cide", meaning to kill, murder, or cause death. The word can refer both to the crime and to the perpetrator of the crime.