rennin

noun 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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Origin and Etymology of rennin

rennet + ¹-in

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First Known Use: 1889

in the meaning defined above

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Medical Dictionary

rennin

noun ren·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