Baathi Of or pertaining to the Baath party. Adjective Of or pertaining to the Baath party. Synonyms: Baathist Origin Transliteration of Arabic بَعْثِيّ (baʕṯiyy). By surface analysis, Baath + -i. Forms more Baathi most Baathi Ba'thi Baʻthi Baʻthī Ba'athi Noun A member of the Baath party. Synonyms: Baathist Forms Baathis Ba'thi Baʻthi Baʻthī Ba'athi ← Previous Baath Next → Baathism