ren·net

[ren-it]
noun
1.
the lining membrane of the fourth stomach of a calf or of the stomach of certain other young animals.
2.
the rennin-containing substance from the stomach of the calf.
3.
a preparation or extract of the rennet membrane, used to curdle milk, as in making cheese, junket, etc.

Origin:
1400–50; late Middle English; compare Old English gerennan, Old High German gerennen to coagulate; akin to run

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rennet (ˈrɛnɪt) [Click for IPA pronunciation guide]
 
n
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
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00:10
Rennet is always a great word to know.
So is gobo. Does it mean:
the offspring of a zebra and a donkey.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

rennet
"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."

rennet
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
Rennet is also a dried extract made from the stomach lining of a ruminant.
In these products the use of rennet casein displaces domestically produced sources of milk protein.
Rennet casein is used to produce materials similar to plastics.
Dissolve rennet in warm water, then stir into milk mixture.
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