Etymology
The word "kidney" comes from the Middle English word "kidne," which is derived from the Old English word "cyððe." The Old English word is thought to be derived from the Proto-Germanic word *kuðjōn-, which also meant "kidney." The Proto-Germanic word is thought to be derived from the Proto-Indo-European word *gʷdʰyós, which meant "stomach" or "belly."
Meaning
The kidney is an organ that filters waste products from the blood and produces urine. The kidneys are located on either side of the spine, behind the stomach. Each kidney is about the size of a fist.
Origin
The kidneys develop from the Wolffian ducts, which are a pair of ducts that run along the sides of the developing embryo. The kidneys begin to develop in the fourth week of gestation and are fully developed by the end of the eighth week.
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