English Etymology Borrowed from Spanish San Dionisio. Proper noun San Dionisio A town in the Usulután department, El Salvador Spanish Pronunciation IPA(key): /ˌsan djoˈnisjo/ [ˌsãn̪ d̪joˈni.sjo] Syllabification: San Dio‧ni‧sio Proper noun San Dionisio m A town in the Usulután department, El SalvadorWikiwand - on Seamless Wikipedia browsing. On steroids.