• synonyms


[ ren-in ]
/ ˈrɛn ɪn /

noun Biochemistry.

a coagulating enzyme occurring in the gastric juice of the calf, forming the active principle of rennet and able to curdle milk.

Nearby words

renminbi, rennes, rennet, rennie, rennie, john, rennin, renninogen, reno, reno, janet, reno-, renogenic

Origin of rennin

First recorded in 1895–1900; renn(et) + -in2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rennin

British Dictionary definitions for rennin


/ (ˈrɛnɪn) /


an enzyme that occurs in gastric juice and is a constituent of rennet. It coagulates milk by converting caseinogen to caseinAlso called: chymosin

Word Origin for rennin

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

Word Origin and History for rennin



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

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for rennin


[ rĕnĭn ]


A milk-coagulating enzyme found especially in the gastric juice of the fourth stomach of young ruminants, used in making cheeses and junkets.chymosin
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for rennin


[ rĕnĭn ]

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