A glandular organ which excretes urea and other waste products from the animal body; a urinary gland.
- Anatomy Either one of a pair of organs in the dorsal region of the vertebrate abdominal cavity, functioning to maintain proper water and electrolyte balance, regulate acid-base concentration, and filter the blood of metabolic wastes, which are then excreted as urine.
- The kidney of certain animals, eaten as food.
- An excretory organ of certain invertebrates.
- Temperment; kind: a person of the same kidney.