: a chemical element of the noble gas group with atomic number 2 that is found especially in natural gases and used chiefly for inflating airships and balloons, as a coolant for superconductors, and as a component of inert atmospheres (as in welding)
—often used before another noun
helium balloons
helium gas
see Chemical Elements Table
Examples of helium in a Sentence
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James Webb Telescope Finds 'Swirling Clouds' on Planet with 22-Hour Day and 1,500-Degree Temps
It is hypothesized to be comprised mostly of hydrogen and helium, which scientists explain likely formed a hugely inflated atmosphere.
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Charna Flam, Peoplemag, 16 May 2024
It’s thought to consist mostly of hydrogen and helium, according to the study published in Nature Astronomy.
—Marcia Dunn, Twin Cities, 14 May 2024
See all Example Sentences for helium 
Charna Flam, Peoplemag, 16 May 2024
It’s thought to consist mostly of hydrogen and helium, according to the study published in Nature Astronomy.
—Marcia Dunn, Twin Cities, 14 May 2024
See all Example Sentences for helium
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“Helium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/helium. Accessed 19 May. 2024.
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Medical Definition
helium
noun
he·li·um
ˈhē-lē-əm 
: a light colorless nonflammable gaseous element found especially in natural gases and used chiefly for inflating airships and balloons, for filling incandescent lamps, and for cryogenic research
—symbol He
see Chemical Elements Table
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