noun

1. lack of appetite for food
2. an eating disorder, chiefly in young women, characterized by aversion to food and obsession with weight loss, and manifested in self-induced starvation and excessive exercise, etc.: in full anorexia ner·vo′·sa (nər vō′sə)
   cf. bulimia

Etymology: ModL < Gr < an-, without + orexis, a desire for < oregein, to reach after < IE base *reg-: see right