proteinuria Syllabification: (pro·tein·u·ri·a)Pronunciation: /ˌprōtnˈ(y)o͝orēə, ˌprōˌtēn-/Definition of proteinuria noun Medicine the presence of abnormal quantities of protein in the urine, which may indicate damage to the kidneys. proteinuria in other Oxford dictionaries Definition of proteinuria in the British & World English dictionary