Definition of rennet
1a
: the contents of the stomach of an unweaned animal and especially a calf
b
: the lining membrane of a stomach or one of its compartments (such as the fourth of a ruminant) used for curdling milk
also
: a preparation of the stomach of animals used for this purpose
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Merriam-Webster unabridged
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Time Traveler for rennet
The first known use of rennet was in the 15th century
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