Kidney (noun)

1. Either of a pair of organs located in the back of the abdomen that filter waste products from the blood and excrete them, in the form of urine, via the urinary tract.
2. The kidney of an animal used as food.

Origin:

Old english cȳd, cȳde "cushion, womb, kidney", of germanic origin; related to dutch kijde and german niere.

Examples:

1. He had a kidney disease.
2. She had a kidney transplant.
3. The kidney functioned normally.
4. The kidney was removed during surgery.
5. The kidney beans were a staple in the diet.