Source : Webster's Revised Unabridged Dictionary (1913)

Neurasthenia \Neu*ras`the*ni"a\, n. [NL., fr. Gr. ? nerve + ?
   weakness.] (Med.)
   A condition of nervous debility supposed to be dependent upon
   impairment in the functions of the spinal cord.

Source : WordNet®

neurasthenia
     n : nervous breakdown (not in technical use)