Baathist /ˈbɑːθɪst/adjective 1noun 1forms 3 adjective1 •Of or pertaining to Baathism or the Baath Party. noun1 •A supporter of Baathism.Another Baathist, former Jordan Foreign Minister Abdullah Rimawi, is plowing a lonely furrow, and no one seems to want to follow him. — 1959 formsBaathists · more Baathist · most Baathist