1) A disorder affecting the cranial nerves or the peripheral nervous system. It is manifested with pain, tingling, numbness, and muscle weakness. It may be the result of physical injury, toxic substances, viral diseases, diabetes, renal failure, cancer, and drugs. -- 2004

2) An abnormal and usually degenerative state of the nervous system or nerves; also, a systemic condition (as muscular atrophy) that stems from a neuropathy.