hydrogen meaning, hydrogen definition | English Cobuild dictionary

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Hydrogen is a colourless gas that is the lightest and commonest element in the universe.      n-uncount  

hydrogen bomb        ( hydrogen bombs    plural  ) A hydrogen bomb is a nuclear bomb in which energy is released from hydrogen atoms.      n-count  
hydrogen peroxide     
Hydrogen peroxide is a chemical that is often used to make hair lighter or to kill germs.      n-uncount  
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