kidney 
kid·ney [kidney kidneys] BrE [ˈkɪdni] NAmE [ˈkɪdni] noun 1. countable either of the two organs in the body that remove waste products from the blood and produce ↑urine •a kidney infection  2. uncountable, countable the kidneys of some animals that are cooked and eaten •steak and kidney pie Word Origin: Middle English: of obscure origin.
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