the lining membrane of the fourth stomach of a calf or of the stomach of certain other young animals.
the rennin-containing substance from the stomach of the calf.
a preparation or extract of the rennet membrane, used to curdle milk, as in making cheese, junket, etc.

1400–50; late Middle English; compare Old English gerennan, Old High German gerennen to coagulate; akin to run Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rennet (ˈrɛnɪt)
1.  a.  the membrane lining the fourth stomach (abomasum) of a young calf
 b.  the stomach of certain other young animals
2.  a substance, containing the enzyme rennin, prepared esp from the stomachs of calves and used for curdling milk in making cheese and junket
[C15: related to Old English gerinnan to curdle, run]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"inner membrane of a calf's stomach," c.1400, probably from an unrecorded O.E. *rynet, related to gerennan "cause to run together," because it makes milk run or curdle; from P.Gmc. *rannijanan, causative of *renwanan "to run" (see run). Cf. Ger. rinnen "to run," gerinnen "to curdle."

variety of apple, c.1568, from Fr. reinette, lit. "little queen," dim. of reine "queen," from L. regina (see Regina).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Dissolve rennet in warm water, then stir into milk mixture.
In these products the use of rennet casein displaces domestically produced sources of milk protein.
Rennet is also a dried extract made from the stomach lining of a ruminant.
Rennet casein is used to produce materials similar to plastics.
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