Definition of rennin in English:

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Pronunciation: /ˈrenən/


An enzyme secreted into the stomach of unweaned mammals, and in some lower animals and plants, causing the curdling of milk.
Example sentences
  • Animal rennet contains the digestive enzyme rennin, which curdles milk in the normal process of digestion.
  • A report on the effect of spices on digestive enzymes mentioned that freshly prepared 1 per cent emulsion of asafoetida in water affected the activity of pepsin, trypsin and rennin in saliva to a small extent 41.
  • In 1990, the FDA approved the first bioengineered enzyme, rennin, which traditionally has been extracted from calves' stomachs for use in making cheese.


Late 19th century: from rennet + -in1.

For editors and proofreaders

Syllabification: ren·nin

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