kidney

 
Pronunciation: /ˈkɪdni/

noun (plural kidneys)

  • 1each of a pair of organs in the abdominal cavity of mammals, birds, and reptiles, that excrete urine.
  • [mass noun] the kidney of a sheep, ox, or pig as food.
  • 2 [mass noun] nature or temperament: I hoped that he would not prove of similar kidney

Origin:

Middle English: of obscure origin