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Definitions
helium Tweet Definition of helium Like Definition of helium on Facebook
noun 
  1. A colorless and inert gas, and the second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602.
Translations: 
  • Dutch: helium
  • French: hélium
  • German: Helium
  • Italian: elio
  • Spanish: helio
Etymology: Modern Latin, from Ancient Greek (polytonic, á) "sun" (because its presence was first theorised in the sun's atmosphere).

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