Deverbal from אַרײַנפֿירן (araynfirn, “to introduce”), from אַרײַן (arayn) + פֿירן (firn); at least in part, a calque of German einführen (“to introduce”), itself a calque of Latin introducere.
אַרײַנפֿיר • (araynfir) m, plural אַרײַנפֿירן (araynfirn)