- [countable]
either of the two organs in the body that remove waste products from the blood and produce urine 肾；肾脏 
a kidney infection 肾感染
- [uncountable, countable]
the kidneys of some animals that are cooked and eaten （食用的）动物腰子 steak and kidney pie 牛肉腰花馅饼
Word OriginMiddle English: of obscure origin.