英语词源字典 - 在线词源网站

frijoles (n.)[frijoles 词源字典]: Mexican kidney beans, 1570s, from Spanish frijoles (plural) "beans," from Latin phaseolus, phaselus "kidney bean," from Greek phaselos a name for a kind of bean.[frijoles etymology, frijoles origin, 英语词源]
kidney (n.): early 14c., of unknown origin, originally kidenere, perhaps a compound of Old English cwið "womb" (see bowel) + 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.