Noun: helium hee-lee-um
- 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)
"Helium is used to inflate balloons and blimps";
- He, atomic number 2
Derived forms: heliums
Type of: argonon, inert gas, noble gas
Encyclopedia: Helium