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Kidney
Pronunciation
Definition 1
One of a pair of organs in the abdomen. The kidneys remove waste and extra water from the blood (as urine) and help keep chemicals (such as sodium, potassium, and calcium) balanced in the body. The kidneys also make hormones that help control blood pressure and stimulate bone marrow to make red blood cells. (NCI Dictionary)
Definition 2
One of the two bean-shaped organs located on each side of the spine in the retroperitoneum. The right kidney is located below the liver and the left kidney below the diaphragm. The kidneys filter and secret the metabolic products and minerals from the blood, thus maintaining the homeostasis. On the superior pole of each kidney there is an adrenal gland. Each kidney and adrenal gland is surrounded by fat. (NCI Thesaurus)
Definition 3
One of a pair of organs in the abdomen. Kidneys remove waste from the blood (as urine), produce erythropoietin (a substance that stimulates red blood cell production), and play a role in blood pressure regulation. (NCI Dictionary)