Definitions for kidneyˈkɪd ni

Random House Webster's College Dictionary

kid•neyˈkɪd ni(n.)(pl.)-neys.

one of a pair of organs in the rear of the upper abdominal cavity of vertebrates that filter waste from the blood, excrete uric acid or urea, and maintain water and electrolyte balance.
Category: Anatomy, Zoology
any similar structure in invertebrates.
Category: Zoology, Anatomy
the meat of an animal's kidney used as food.
Category: Cooking
constitution or temperament.
kind; sort:
to associate only with people of one's own kidney.

Origin of kidney:

1275–1325; ME kidenei,kidenere (sing.), kideneres, kideneren (pl.)

Princeton's WordNet

kidney(noun)
either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine
"urine passes out of the kidney through ureters to the bladder"

Kernerman English Learner's Dictionary

kidney(noun)ˈkɪd ni
one of two organs that clean the blood in your body

Wiktionary

kidney(Noun)
An organ in the body that filters the blood, producing urine.
kidney(Noun)
This organ (of an animal) cooked as food
kidney(Noun)
constitution, temperament, nature

Origin: From kednei, kidenei, from earlier kidnere, kidenere. Of uncertain origin. Probably a compound consisting of *, from cwiþ, cwiþa + nere, from *, from neuran, from negʷh-r-. If so, then related to nier, Niere, nyre, njure.

Webster Dictionary

Kidney(noun)
a glandular organ which excretes urea and other waste products from the animal body; a urinary gland
Kidney(noun)
habit; disposition; sort; kind
Kidney(noun)
a waiter