Where does “selēnium” come from?

selēnium (Latin) comes from Latin -ium, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “selēnium”, step by step

StepLanguageWordMeaning
1Latin-iumSuffix used to form abstract nouns, sometimes...
2Latin-iusforming adjectives from nouns; nominative neuter...
3Proto-Italic-jōsForms comparative adjectives
4Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yós →Every word from Latin -ium →Every word from Latin -ius →