A disease in which there is a perpetual and insatiable appetite for food; a diseased and voracious appetite.  [1913 Webster]

 a disordered eating habit characterized by occasional episodes of excessive eating, followed by self-induced vomiting or abuse of laxatives, to avoid gaining weight; it is often accompanied by feelings of guilt; -- called also bulimia nervosa and binge-purge syndrome. It is observed mainly in young women of normal weight.  [PJC]