n, pl  kidneys  1  :  one of a pair of vertebrate organs situated in the body cavity near the spinal column that excrete waste products of metabolism, in humans are bean-shaped organs about 4½ inches (11½ centimeters) long lying behind the peritoneum in a mass of fatty tissue, and consist chiefly of nephrons by which urine is secreted, collected, and discharged into the pelvis of the kidney whence it is conveyed by the ureter to the bladder - compare MESONEPHROS METANEPHROS PRONEPHROS  2

:  any of various excretory organs of invertebrate animals .
 
 
 
Similar sounding terms:  cDNA  co·deine  co·don  cot·ton 
 
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