champignon
noun
                                                                                                                            
                                                            cham·pi·gnon
                    
                                                                                                              
                                                                                                                                  (ˌ)sham-pē-ˈnyōn  
                                                                                                                              
            (ˌ)shäm-,
                                                                                                                              -ˈnyōⁿ;
                                                                                                                              sham-ˈpin-yən,
                                                                                                                              cham-
                                                      
                                                          
                                
              
          
                                                      : an edible fungus                                      
                
                                
            especially                
          
                                                      : button mushroom                                      
            
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  Merriam-Webster unabridged




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