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rennin

[ren-in] /ˈrɛn ɪn/
noun, Biochemistry
1.
a coagulating enzyme occurring in the gastric juice of the calf, forming the active principle of rennet and able to curdle milk.
Origin of rennin
1895-1900
1895-1900; renn(et) + -in2
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rennin

rennin

/ˈrɛnɪn/
noun
1.
an enzyme that occurs in gastric juice and is a constituent of rennet. It coagulates milk by converting caseinogen to casein Also called chymosin
Word Origin
C20: from rennet + -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 rennin
n.

milk-curdling enzyme, 1897, from rennet + -in (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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rennin in Medicine

rennin ren·nin (rěn'ĭn)
n.
A milk-coagulating enzyme found especially in the gastric juice of the fourth stomach of young ruminants, used in making cheeses and junkets. Also called chymosin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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rennin in Science
rennin
  (rěn'ĭn)   
An enzyme that catalyzes the coagulation of milk. Rennin is found in the gastric juice of the fourth stomach of young ruminants and is used in making cheese. Also called chymosin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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