Where does “selenious” come from?

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

selenious (English): Of, pertaining to, or containing selenium,...

Definitions

Of, pertaining to, or containing selenium,...

Ancestry of “selenious”, step by step

Step	Language	Word	Meaning
1	English	-ious	Alternative spelling of -ous; "forming...
2	Latin	-ius	forming adjectives from nouns; nominative neuter...
3	Proto-Italic	-jōs	Forms comparative adjectives
4	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →