Entry 1 sense Webster, 1913 genocidal · gen·o·cid·al · IPA /ˌd͡ʒɛnəˈsaɪdəl/ 01 a. Of or pertaining to genocide; as, the genocidal policies of the Serbs in Bosnia. 1. Of or pertaining to genocide; as, the genocidal policies of the Serbs in Bosnia.