|
|
| he·li·um [ hlee əm ] |
noun |
|
| Definition: |
| |
inert gas: a nonflammable inert gaseous element that is colorless and odorless. Source: natural gas. Use: inert atmospheres, cryogenic research, lasers, inflating balloons.
Symbol He
|
| [Late 19th century. < Greek hēlios "sun"; because its existence was deduced from its emission line in the solar spectrum] |
|
