English
heliumless
From helium + -less.
Formed from helium + -less
Proto-Indo-European *sóh₂wl̥ ‘sun’
Proto-Hellenic *hāwélios ‘sun’
Ancient Greek ἥλιος ‘sun’
New Latin helium
English helium
Today it means
adj Without helium; not requiring helium.
Language periods are conventional ranges, not dates for this word.
Etymograph / heliumless