[he.li.um] n [NL, fr. Gk helios] (1872): a light colorless nonflammable gaseous element found esp. in natural gases and used chiefly for inflating airships and balloons, for filling incandescent lamps, and for cryogenic research
HELIUM
Meaning of HELIUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012