曾祖 Traditional form: 曾祖 Pinyin (reading): zēngzǔ Definitions: great-grandfather (father of one's paternal grandfather) Characters: 曾 - already, formerly, once; the past 祖 - ancestor, forefather; grandfather; surname Traditional characters: 曾 - already, formerly, once; the past 祖 - ancestor, forefather; grandfather; surname