MORDECAI . 1. A cousin (?) of queen Esther, who thwarted Haman’s plot against the Jews. See Esther and Esther [Book of]. 2. One of those who returned with Zerub. ( Ezra 2:2 , Nehemiah 7:7 ); called in Esther 5:8 Esther 5:8 Mardocheus .