Where does “-idium” come from?

-idium (English) comes from Ancient Greek -ίδιον — suffixed to nouns of any gender, forms neuter...

Ancestry of “-idium”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	-ίδιον	suffixed to nouns of any gender, forms neuter...

-idium — Etymology, Origin & Word History | Etymology Explorer