English

heliox

Blend of heli(um) + ox(ygen).

Proto-Indo-European *sóh₂wl̥ ‘sun’

Proto-Hellenic *hāwélios ‘sun’

Ancient Greek ἥλιος ‘sun’

New Latin helium

Proto-Indo-European *ǵenh₁- ‘to produce’

Proto-Indo-European *ǵénh₁os ‘race, lineage’

Proto-Hellenic *génos ‘race’

Ancient Greek γένος ‘race, stock, kin’

French oxygène

Today it means

noun A mixture of helium and oxygen used as a breathing gas.

Language periods are conventional ranges, not dates for this word.