English
thorium
From Thor + -ium.
A compound of Thor + -ium
Proto-Indo-European *(s)tenh₂- ‘to thunder’
Proto-Germanic *Þunraz
Proto-Norse *þonaraz
Old Norse Þórr
English Thor
Today it means
noun A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.
Language periods are conventional ranges, not dates for this word.
Etymograph / thorium