Definition of actinidin
: an enzyme found especially in the kiwifruit that breaks down protein by hydrolysis and is used chiefly as a tenderizer for meat When you're cooking with kiwi, remember they contain an enzyme called actinidin that prevents gelatin from setting up in the same way that the enzyme bromelain in pineapple does. — Barbara Durbin, The Oregonian (Portland, Oregon), 21 Aug. 2001
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