From Longman Dictionary of Contemporary Englishkidney beanˈkidney bean noun [countable] 
DFFHBPa dark red bean that is shaped like the letter C
DFFHBPa dark red bean that is shaped like the letter CExamples from the Corpus
kidney bean• Serve with a red kidney bean salad.• This is all wrong, as chilli should really be made with pinto beans, a member of the kidney bean family.• Both types belong to the kidney bean family and have a slightly nutty flavour. 