The Collaborative International Dictionary of English v.0.48:

Neurotic \Neu*rot"ic\, a. [Gr. ney^ron nerve.]
   1. Of or pertaining to the nerves; seated in the nerves;
      nervous; as, a neurotic disease.
      [1913 Webster]

   2. Useful in disorders of, or affecting, the nerves.
      [1913 Webster]

   3. Of or pertaining to neurosis[2]; characteristic of
      neurosis[2]; caused by neurosis[2].
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Neurotic \Neu*rot"ic\, n.
   1. A disease seated in the nerves.
      [1913 Webster]

   2. (Med.) Any toxic agent whose action is mainly directed to
      the great nerve centers.
      [1913 Webster]

   Note: Neurotics as a class include all those poisons whose
         main action is upon the brain and spinal cord. They may
         be divided into three orders: (a) Cerebral neurotics,
         or those which affect the brain only. (b) Spinal
         neurotics, or tetanics, those which affect the spinal
         cord. (c) Cerebro-spinal neurotics, or those which
         affect both brain and spinal cord.
         [1913 Webster]

   3. A person afflicted with a neurosis[2].
      [PJC]

WordNet (r) 3.0 (2006):

neurotic
    adj 1: characteristic of or affected by neurosis; "neurotic
           disorder"; "neurotic symptoms"
    2: affected with emotional disorder [syn: neurotic,
       psychoneurotic] [ant: unneurotic]
    n 1: a person suffering from neurosis [syn: neurotic,
         psychoneurotic, mental case]