Definition of Helium 1. A very light colorless 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) Noun Synonyms for word "helium" Semanticaly linked words with "helium" Hyponims for word "helium" has derived form -ium etymology antihelium etymology heliumlike etymology nonhelium etymology orthohelium etymology parahelium etymology radiohelium etymology ヘリウム [Japanese] etymology helium etymology هيليوم etymologically related Helios etymologically related helio- etymological origin of helium [Latin] is derived from heliair is derived from heliox is derived from helium burning is derived from helium dating is derived from helium flash is derived from helium fusion is derived from helium speech is derived from helium star is derived from helium variable is derived from helium-3 is derived from helium-4 is derived from heliums is derived from liquid helium is derived from orthohelium is derived from parahelium