Definition of rennet noun from the Oxford Advanced Learner's Dictionary

 

rennet

 noun
noun
BrE BrE//ˈrenɪt//
 
; NAmE NAmE//ˈrenɪt//
 
[uncountable]
 
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a substance that makes milk thick and sour and is used in making cheese Word Origin late 15th cent.: probably related to run.
See the Oxford Advanced American Dictionary entry: rennet