• (renal) Of or pertaining to the kidney.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• (renal) Pertaining to the kidneys.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Body organ that filters blood for the secretion of urine and that regulates ion concentrations.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Corticomedullary organ which has as its part renal pelvis shared with and connected to ureter. Examples: There are only two, right kidney and left kidney.
  Foundational Model of Anatomy
  University of Washington, 2017
• 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 of Cancer Terms
  U.S. National Cancer Institute, 2021
• 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 secrete metabolic products and minerals from the blood, thus maintaining homeostasis. On the superior pole of each kidney there is an adrenal gland. Each kidney and adrenal gland is surrounded by fat.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• The organs of the urinary tract located in the retroperitoneal cavity adjacent to the spine and composed of the renal cortex and the renal medulla.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• The kidneys are bean-shaped organs that figure prominently in the urinary tract. Each is about 4 to 5 inches (12 centimeters) long and weighs about one third of a pound (150 grams). One lies on each side of the spinal column, just behind the abdominal cavity, which contains the digestive organs.
  Merck Manuals
  Merck & Co., Inc., 2020
• The kidneys are paired retroperitoneal structures that are normally located between the transverse processes of T12-L3 vertebrae, with the left kidney typically somewhat more superior in position than the right. The upper poles are normally oriented more medially and posteriorly than the lower poles.
  Medscape
  WebMD, 2019
• Kidney, in vertebrates and some invertebrates, organ that maintains water balance and expels metabolic wastes. Primitive and embryonic kidneys consist of two series of specialized tubules that empty into two collecting ducts, the Wolffian ducts. The more advanced kidney...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020