filicide Syllabification: (fil·i·cide)Pronunciation: /ˈfiləˌsīd/Definition of filicide noun the killing of one’s son or daughter:maternal filicide a person who kills their son or daughter. Origin: mid 17th century from Latin filius 'son', filia 'daughter' + -cidefilicide in other Oxford dictionaries Definition of filicide in the British & World English dictionary