hydrogen

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Pronunciation[change]

Noun[change]

Singular
hydrogen

Plural
hydrogens

Hydrogen's place on the periodic table
An airship full of hydrogen gas
  1. (uncountable) The lightest chemical element (symbol H) with an atomic number of 1.
    Hydrogen gas is highly flammable.
  2. (countable) A hydrogen bomb (H-bomb), or fusion bomb, is a nuclear weapon.