n :  a crystallizable enzyme that coagulates milk, that occurs esp. with pepsin in the gastric juice of young animals and is obtained as a yellowish powder, grains, or scales usu. 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  .
 
 
 
Similar sounding terms:  re·nin 
 
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