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• n  a proteolytic enzyme obtained from the unripe papaya; used as a meat tenderizer

• If papain had the same effect on human slipped discs, he reasoned, they would shrink back into place.
• One evening, he gave adolescent rabbits intravenous injections of papain.
• If children cried for Castoria in those days, they kicked papain the shins for Buster Brown and his sweetheart, Mary Jane, and his dog, Tige.