hydrogen

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hydro|gen /h'aɪdrədʒən/
[N-UNCOUNT]
Hydrogen is a colourless gas that is the lightest and commonest element in the universe.hydro|gen bomb (hydrogen bombs)
[N-COUNT]
A hydrogen bomb is a nuclear bomb in which energy is released from hydrogen atoms.hydro|gen per|ox|ide
[N-UNCOUNT]
Hydrogen peroxide is a chemical that is often used to make hair lighter or to kill germs.

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ablaze

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allowance

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