KU KLUX KLAN Meaning of KU KLUX KLAN in English [ ˌku: klʌks'klan ]■ noun an extreme white supremacist secret society in the US.DerivativesKu Kluxer noun Originperh. from Gk kuklos 'circle' and clan . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004