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ren·nin | \ ˈre-nən 
\
\Definition of rennin
: 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
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rennin
nounren·nin | \ ˈren-ən \
\Medical Definition of rennin
: 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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The first known use of rennin was in 1889
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