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[ree-nin] /ˈri nɪn/
noun, Biochemistry.
a proteolytic enzyme secreted by the kidneys that is involved in the release of angiotensin.
Origin of renin
First recorded in 1890-95; ren(i)- + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for renin


a proteolytic enzyme secreted by the kidneys, which plays an important part in the maintenance of blood pressure
Word Origin
C20: from reni- + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for renin

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

Online Etymology Dictionary, © 2010 Douglas Harper
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renin in Medicine

renin re·nin (rē'nĭn, rěn'ĭn)
A protein-digesting enzyme that is released by the kidneys and that catalyzes the hydrolysis of angiotensinogen to angiotensin I. Also called angiotensinogenase.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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renin in Science
  (rē'nĭn, rěn'ĭn)   
A proteinase enzyme of high specificity that is released by the kidney and acts to raise blood pressure by activating angiotensin. See also angiotensin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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