helium

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“
We need helium, and the helium is what we really need to go deep.

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Definitions (4)

Toggle American Heritage definitions American Heritage Dictionary (1)

  1. noun A colorless, odorless inert gaseous element occurring in natural gas and with radioactive ores. It is used as a component of artificial atmospheres and laser media, as a refrigerant, as a lifting gas for balloons, and as a superfluid in cryogenic research. Atomic number 2; atomic weight 4.0026; boiling point -268.9°C; density at 0°C 0.1785 gram per liter. See Table at element.

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Examples (50)

  • We need helium, and the helium is what we really need to go deep. —  Richard Pyle dives the reef's Twilight Zone
  • The gas mixtures that let men live at the lower depths and higher pressures contained a lot of helium, and a man talking in a helium-oxygen mixture sounds like Donald Duck. —  Analog July, 1974
  • Why, man, get this—the nucleus of an atom of helium is an en­dothermic compound emitting one point seventy-five multiplied by the eleventh power of ten gram-calories of energy per gram when it is formed from four protons and two electrons. —  Astounding Stories January, 1935
  • Shielding is obtained fran an inert gas such as helium or argon. —  MyLinkVault Newest Links
  • Shielding is obtained from an inert gas such as helium or argon. —  MyLinkVault Newest Links
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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. From Greek hēlios, sun (so called because its existence was deduced from the solar spectrum); see sāwel- in Indo-European roots.

Toggle Century etymologies Century Dictionary (1)

  1. New Latin, from Greek ἡλιος, the sun: see heliac.
 

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/ˈhiliəm/
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