Where does “magistralis” come from?

magistralis (Latin) comes from Latin magister, from Proto-Italic magisteros, from Proto-Indo-European méǵh₂isteros, from Proto-Indo-European méǵh₂s — big, great.

Ancestry of “magistralis”, step by step

Step	Language	Word	Meaning
1	Latin	magister	teacher; master; a title of the Middle Ages,...
2	Proto-Italic	magisteros	—
3	Proto-Indo-European	méǵh₂isteros	—
4	Proto-Indo-European	méǵh₂s	big, great

Every word from Proto-Indo-European méǵh₂s →

magistralis — Etymology, Origin & Word History | Etymology Explorer