polyneuritis n inflammation of many or all of the peripheral nerves (as in leprosy) Usage(s) He observed too that fowls suffered from an analogous polyneuritis and were feeding largely on polished rice. When the pigeons got the coating they thrived; when they did not they suffered from polyneuritis. Other names: Landry's paralysis, infectious (or postinfectious) polyneuritis, acute idiopathic polyneuritis, and even encephalo-myeloradiculoneuritis. Synonym(s) multiple neuritis