Scrabble & Words with friends points
        
        
                    - pentoxide is a valid Scrabble US word with a point value of 19
 
          
                    - pentoxide is a valid Scrabble UK word with a point value of 19
 
          
                    - pentoxide is a valid Words with friends word with a point value of 21
 
          
        
        Definition of pentoxide
        
        
          - an oxide containing five atoms of oxygen in the molecule (noun)
         
        See definition of pentoxide in Merriam Webster