Synonyms

kidneys

Cultural

A pair of organs, the principal parts of the excretory system, located above the waistline at the back of the abdominal cavity. The kidneys filter waste materials from the blood, excreting these wastes in the form of urine; they also regulate the amounts of water and other chemicals in body fluids.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Kidneys play an essential role in clearing waste and toxins from the bloodstream, removing these substances through urine.

From Science Daily • Dec. 5, 2025

Kidneys harboring pig cells would provoke immune attacks if they were inserted into patients.

From Science Magazine • Sep. 7, 2023

Kidneys don’t just make urine - they provide a wide range of jobs in the body.

From Washington Times • Aug. 16, 2023

Kidneys are especially needed in Native American communities, where one-quarter of the population is diabetic, she said.

From Seattle Times • Dec. 19, 2022

The Kidneys and their Work.—What is the work of the kidneys?

From First Book in Physiology and Hygiene by Kellogg, John Harvey

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023