Source : Webster's Revised Unabridged Dictionary (1913)

Anorexia \An`o*rex"i*a\, Anorexy \An"o*rex`y\n. [Gr. ?; 'an
   priv. + ? desire, appetite, ? desire.] (Med.)
   Want of appetite, without a loathing of food. --Coxe.

Source : WordNet®

anorexia
     n : a prolonged disorder of eating due to loss of appetite