abdominal       
adjective uk/æbˈdɒm.ɪ.nəl/ us/æbˈdɑː.mə.nəl/
 腹部的
in, forming, or relating to the abdomen
  abdominal pains 腹痛 
 A membrane covers the abdominal cavity. 覆盖腹腔的一层膜。 
 This exercise works your abdominal muscles. 这种练习会锻炼你的腹肌。 
 See: abdomen
 - More examples
 - He underwent abdominal surgery last week.
 - The inner surface of the abdominal wall is pink and shiny.