ren

1. (anatomy) A kidney.Examples: "Having treated laſt of the expulſion of the inteſtinal fæces, we come next to conſider thoſe organs, which ſeparate and throw off another principal excrementitious matter, to wit, urine. The firſt of which is the renes or kidneys."; "We find, however, that the detrita, consisting principally of effete hydrogen and carbon, brought into the circulation by the absorbents, are constantly making their escape from the system by way of the renes, skin, and lungs, in the forms of water, and carbonic-acid."; "It would probably have been considered an important omission if I had not mentioned Water as a substance excreted freely by the renes or kidneys."