Where does “dimanganèse” come from?

dimanganèse (French) comes from French manganèse, from Italian manganese, from New Latin magnēsium, from Ancient Greek Μαγνησία, from Ancient Greek -ῐ́ᾱ, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

dimanganèse (French): dimanganese

Definitions

dimanganese

Ancestry of “dimanganèse”, step by step

Step	Language	Word	Meaning
1	French	manganèse	manganese
2	Italian	manganese	manganese
3	New Latin	magnēsium	—
4	Ancient Greek	Μαγνησία	Magnesia
5	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
6	Proto-Indo-European	-íh₂	—
7	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek Μαγνησία →