The Collaborative International Dictionary of English v.0.48:
anorexia \an`o*rex"i*a\ ([a^]n`[-o]*r[e^]ks"[i^]*[.a]), anorexy \an"o*rex`y\ ([a^]n"[-o]*r[e^]ks`[y^])n. [Gr. 'anorexi`a; 'an priv. + 'o`rexis desire, appetite, 'ore`gein desire.] (Med.) Loss of appetite for food. --Coxe. [1913 Webster + AS]WordNet (r) 3.0 (2006):
anorexia n 1: a prolonged disorder of eating due to loss of appetite