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kidney (n.)

early 14c., kidenere, a word of unknown origin, perhaps a compound of Old English cwið "womb" (see chitterlings) + ey "egg" (see egg (n.)) in reference to the shape of the organ. Figurative sense of "temperament" is from 1550s. Kidney-bean is from 1540s, so called for its shape.

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Definitions of kidney from WordNet

kidney (n.)
either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine;
urine passes out of the kidney through ureters to the bladder
From wordnet.princeton.edu