papain: a proteolytic enzyme obtained from the unripe papaya; used as a meat tenderizer
enzyme: any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
nim: game in which matchsticks are arranged in rows and players alternately remove one or more of them; in some versions the object is to take the last remaining matchstick on the table and in other versions the object is to avoid taking the last remaining matchstick on the table