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he·li·um
 helium
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- 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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