gen·o·cide 
(jĕnə-sīd′)
(jĕnə-sīd′)n.
The systematic and widespread extermination or attempted extermination of a national, racial, religious, or ethnic group.
[Greek genos, race; see genə- in the Appendix of Indo-European roots + -CIDE.]
gen′o·cidal (-sīdl) adj.
gen′o·cidal·ly adv.