Etymology
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rennin (n.)

milk-curdling enzyme, 1897, from rennet (n.1) + -in (2).

updated on July 03, 2021

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Definitions of rennin from WordNet

rennin (n.)
an enzyme that occurs in gastric juice; causes milk to coagulate;
Synonyms: chymosin
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.