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Douglas Harper's Etymology Dictionary
renin

enzyme found in kidneys, 1894, from German Renin, from Latin renes "kidneys" + -in (2).

Wiktionary
renin

n. (context enzyme English) A circulating enzyme released by mammalian kidneys that converts angiotensinogen to angiotensin-I. Because its activity ultimately leads to formation of angiotensin-II and aldosterone, this hormone plays a role in maintaining blood pressure.

WordNet
renin

n. a proteolytic enzyme secreted by the kidneys; catalyzes the formation of angiotensin and thus affects blood pressure

Wikipedia
Renin

Renin (etymology and pronunciation), also known as an angiotensinogenase, is a protein and enzyme that participates in the body's renin-angiotensin aldosterone system (RAAS)—also known as the renin-angiotensin-aldosterone axis—that mediates extracellular volume (i.e., that of the blood plasma, lymph and interstitial fluid), and arterial vasoconstriction. Thus, it regulates the body's mean arterial blood pressure.

Renin is often improperly referred to as a hormone even though it has no peripheral receptors and rather has an enzymatic activity with which it hydrolyzes angiotensinogen to angiotensin I.

Usage examples of "renin".

Keir Renin, the officer in charge of the camp, was a broad-faced man, who seemed to regard his assignment as some sort of punishment.

Keir Renin would be expecting such haughty remarks from a Habber, and Benzi could not resist making them.

My fury had grown so high by the time of my return, that I set Renin and her Sonna all about the place I had chosen to take my rest.

Pleased anticipation gleamed from the light eyes of Renin, anticipation of other than the witnessing of a battle to the death.

Should all present prove to have naught save the courage of Renin, however, best would undoubtedly be that I be ended upon the instant.

Faris take herself out of the tent into the darkness and still-falling rain, and Renin of the Sonna gestured to the leather we stood upon.

Greatly disturbed did Renin seem, though she disallowed much outward evidence of it, and she shook her head as Ennat and I looked upon her.

Already had Melid of the Sarra and Tarit of the Samma joined us the while Renin spoke, and all eyes turned to the newcomers.