DictionarykidneyBlood-filtering organ
noun

kidney

KID-nee/ˈkɪdni/

A paired organ that filters blood to form urine.

Your kidneys filter waste from your blood and produce urine.

A single human kidney in a clear anatomical cutaway, showing its bean-shaped exterior, internal filtering tissue, blood vessels and urine-draining ureter.
Etymology

Middle English kidenere already named the organ, but its origin is unknown. A suggested combination meaning “womb” and “egg” would allude to the organ’s shape; that explanation remains uncertain.

In context

Progressive Discussions12:55
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More examples

  • She donates a kidney to her brother.
  • The scan shows a small stone in his left kidney.
  • The kidneys help control the amount of water in your body.

Forms

kidney · kidneys