Definition of helium
: a chemical element of the noble gas group 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) — see Chemical Elements Table
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Merriam-Webster unabridged
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Time Traveler for helium
The first known use of helium was in 1871
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