helium Meaning, Definition & Usage
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noun a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
atomic number 2; He.
WordNet
He"li*um noun
Etymology
NL., fr. Gr. the sun.Definitions
(Chem.) A gaseous element found in the atmospheres of the sun and earth and in some rare minerals. Symbol He, atomic number 2. A noble (or rare) gas.