anorexia
/ˌænəˈreksɪə/noun
mass noun
1- lack or loss of appetite for food (as a medical condition), in particular食欲缺乏, 厌食, 尤指：
1.1
- （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。
词源
late 16th cent.: via late Latin from Greek， from an- 'without' + orexis 'appetite'.