<p><strong>Noun</strong></p><ul><li>(Anatomy) Either of a pair of bean-shaped organs in the back part of the abdominal cavity that form and excrete urine, regulate fluid and electrolyte balance, and act as endocrine glands.</li><li>(Zoology) A corresponding organ in other vertebrate animals or an organ of like function in invertebrates.</li><li>The meat of an animal's kidney used as food.</li><li>Constitution or temperament: He was a quiet child, of a different kidney from his boisterous brothers.</li><li>Kind, sort, or class: He is only at ease with men of his own kidney.</li></ul>