polyneuritis Syllabification: (pol·y·neu·ri·tis)Pronunciation: /ˌpälin(y)o͝orˈītis/Definition of polyneuritis noun Medicine any disorder that affects the peripheral nerves collectively. Derivatives polyneuriticPronunciation: /-n(y)o͝orˈitik/ adjective polyneuritis in other Oxford dictionaries Definition of polyneuritis in the British & World English dictionary