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Noun: helium  hee-lee-um
  1. A very light colourless 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)
    - He, atomic number 2

Derived forms: heliums

Type of: argonon, chemical element, element, inert gas, noble gas

Encyclopedia: Helium