Webster's English Dictionary

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kidney

kid.ney \'kid-ne-\ n [ME] 1a: one of a pair of vertebrate organs situated 
   in the body cavity near the  spinal column that excrete waste products of 
   metabolism, in man are bean-shaped organs about 41/2 inches 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 a main 
   cavity whence it is conveyed by the ureter to the bladder 1b: any of 
   various excretory organs of invertebrate animals  2: the kidney of an 
   animal eaten as food by man  3a: TEMPERAMENT, DISPOSITION  3b: KIND, SORT