The suffix <em>-itis </em>which comes from Greek means <em>inflammation. </em>Since the root <em>neuro </em>refers to the nerves or nervous system, like the question said, it means that the combination of <em>neuro </em>and <em>-itis </em>in <em>neuritis </em>means <em>an inflammation of the nerves. </em>
Neurology is the study of nerves; nervous is the state of being anxious or worried; neuroism doesn't exist in English.
