he‧li‧um /ˈhiːliəm/
noun [uncountable][
Date: 1800-1900;
Language: Greek;
Origin: helios 'sun'; because it was discovered in the sun's spectrum]
a gas that is lighter than air and is used to make
balloons float. It is a chemical
element: symbol He
[TahlilGaran] Dictionary of Contemporary English ▲