See Also: helium-3(medicine)
helium-4(medicine)
helium(medicine)
helium(dictionary)
helium(encyclopedia)
helium(dictionary)
helium speech(medicine)
helium dating(encyclopedia)
helium (oh)
[Date: 1800-1900; Language: Greek; Origin: helios 'sun'; because it was discovered in the sun's spectrum]
a gas that is lighter than air and is used to make balloons float. It is a chemical element : symbol He
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