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 Unabridged Dictionary, © Random House, Inc. 2019

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 for renin

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

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

Medicine definitions for renin


[rēnĭn, rĕnĭn]


A protein-digesting enzyme that is released by the kidneys and that catalyzes the hydrolysis of angiotensinogen to angiotensin I.angiotensinogenase
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for renin


[rēnĭn, rĕnĭn]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.