kidney bean 
noun
A kidney-shaped bean, especially a dark red one from a dwarf French bean plant.At this time his body was smaller than a kidney bean, and just beginning to form limb buds - his future arms and legs....
- The active ingredient in these products is an extract derived from a white kidney bean called Phaseolus vulgaris.
- I was newly pregnant with my first child, whose embryo was about the size of a kidney bean.
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- Magnificat
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