[mass noun]lack or loss of appetite for food (as a medical condition), in particular 食欲缺乏,厌食,尤指 ■(亦作 anorexia nervosa )an emotional disorder characterized by an obsessive desire to lose weight by refusing to eat, and a distorted perception of one's own body 神经性厌食症
语源
late 16th cent.: via late Latin from Greek, from an- 'without' + orexis 'appetite'