: an enzyme that coagulates milk and is used in making cheese and junkets
especially
: one from the mucous membrane of the stomach of a calf
Dictionary Entries Near rennin
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“Rennin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rennin. Accessed 26 Nov. 2024.
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rennin
noun
ren·nin
ˈren-ən 
: a stomach enzyme that curdles milk
Medical Definition
rennin
noun
ren·nin
ˈren-ən
: a crystallizable enzyme that coagulates milk, that occurs especially with pepsin in the gastric juice of young animals and is obtained as a yellowish powder, grains, or scales usually by extraction of the mucous membrane of the fourth stomach of calves, and that is used chiefly in making cheese and casein for plastics
called also chymosin
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