peroxisome
noun
                                                                                                                            
                                                            per·ox·i·some
                    
                                                                                                              
                                                                                                                                  pə-ˈräk-sə-ˌsōm  
                                                      
                                                          
            
                                
              
          
                                                      : a cytoplasmic cell organelle containing enzymes (such as catalase) which act in oxidative reactions and especially in the production and decomposition of hydrogen peroxide                                      
                
                    
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  Merriam-Webster unabridged




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