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hydrogen
noun (symbol H, atomic number 1) a flammable colourless odourless gas which is the lightest of all known substances and by far the most abundant element in the universe.
[18c: from French hydrogène , from hydro- + Greek gennaein to produce]
hydrogen bomb or H-bomb
noun , mil a bomb which releases vast amounts of energy as a result of hydrogen nuclei being converted into helium nuclei by fusion, a process started by a fission bomb. Also called thermonuclear bomb.
hydrogen bond
noun , chem a weak chemical bond between an electronegative atom with a lone pair of electrons (eg oxygen, nitrogen, fluorine) and covalently bonded hydrogen atoms.
hydrogen carbonate
noun , chem an acid salt of carbonic acid. Also called bicarbonate.
hydrogen chloride
noun , chem (formula HCl) a poisonous colourless and corrosive gas prepared by treating sodium chloride with concentrated sulphuric acid.

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