He is best known for his work against genocide , a word he coined in 1943 or 1944 from the rooted words `` genos '' ( Greek for family , tribe , or race ) and '' - cide '' ( Latin for killing ) .
He is best known for his work against genocide , a word he coined in 1943 from the root words `` genos '' ( Greek for family , tribe or race ) and '' - cide '' ( Latin for killing ) .