polyneuritisPronunciation: /ˌpɒlɪnjʊəˈrʌɪtɪs/Definition of polyneuritis noun [mass noun] Medicine any disorder that affects the peripheral nerves collectively. Derivatives polyneuriticPronunciation: /-ˈrɪtɪk/ adjective polyneuritis in other Oxford dictionaries Definition of polyneuritis in the US English dictionary