Where does “extremist” come from?

extremist (Dutch) comes from Dutch extreem, from French extrême, from Middle French extreme, from Latin extrēmus, from Proto-Italic eksterisemos.

extremist (Dutch): extremist

Definitions

Step	Language	Word	Meaning
1	Dutch	extreem	extreme; extremely
2	French	extrême	extreme
3	Middle French	extreme	extreme
4	Latin	extrēmus	—
5	Proto-Italic	eksterisemos	—

extremist — Etymology, Origin & Word History | Etymology Explorer