Mankiller, Wilma Syllabification: (Man·kil·ler, Wilma)Pronunciation: /ˈmanˌkilər/Definition of Mankiller, Wilma (1945–2010), US Cherokee Nation tribal leader 1985–95 and historian; full name Wilma Pearl Mankiller. A women’s rights activist, she wrote Mankiller: A Chief and Her People (1993).