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helium

he·li·um

helium

 
pronunciation:
hi li m
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition: a chemical element of the inert gas group that contains two protons in each nucleus and that occurs as a lighter-than-air gas often used for lifting power and in air-free atmospheres where an inert gas is required, as in welding. (symbol: He)
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  element