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]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "neurotic":
   abnormal, alcoholic, alternating personality,
   antisocial personality, anxious, brain-damaged, brain-injured,
   catatonic, certifiable, confused, deviant, disordered,
   disordered personality, distraught, disturbed,
   disturbed personality, double personality, drug user,
   dual personality, emotionally unstable personality, escapist,
   hostile personality, hypochondriac, hypochondriast, hysteric,
   idiot, imaginary invalid, immature personality,
   inadequate personality, inferior personality, irrational,
   malade imaginaire, maladjusted, maladjusted personality,
   manic-depressive, mentally defective personality, mentally ill,
   mentally sick, moral insanity, multiple personality, nervous,
   neurasthenic, neuropath, neurotic personality, obsessive,
   overwrought, paranoiac, paranoid, paranoid personality,
   perverse personality, phobic, psychasthenic, psychoneurotic,
   psychopath, psychopathic, psychopathic personality, psychotic,
   psychotic personality, schiz, schizoid, schizoid personality,
   schizophrenic, schizy, seclusive personality, sexual psychopath,
   shut-in personality, sociopath, split personality, unstable,
   valetudinarian, valetudinary, weak personality