Where does “magnesia” come from?

Magnesia comes from Middle English magnesia, from Late Latin magnesia, from Ancient Greek μαγνησία, derived from the place name Μαγνησία with the suffix -ῐ́ᾱ.

magnesia (English): magnesium oxide

Definitions

magnesium oxide

Ancestry of “magnesia”, step by step

Step	Language	Word	Meaning
1	Middle English	magnesia	—
2	Late Latin	magnesia	—
3	Ancient Greek	Μαγνησία	Magnesia
4	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
5	Proto-Indo-European	-íh₂	—
6	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 →