restenosis Syllabification: (re·ste·no·sis)Pronunciation: /ˌrēstəˈnōsəs/Definition of restenosis noun Medicine the recurrence of abnormal narrowing of an artery or valve after corrective surgery. Origin: 1950s: from re- 'again' + stenosisrestenosis in other Oxford dictionaries Definition of restenosis in the British & World English dictionary