C2 [ C ] either of a pair of small organs in the body that take away waste matter from the blood to produce urine肾,肾脏
[ C or U ] these organs from an animal, used as food(可食用的动物)腰子
More examples
She suffered kidney failure and needed a blood transfusion.
kidney transplant
The kidney plays a vital role in the removal of waste products from the blood.
kidney dialysis
She fried some kidneys in butter.
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