köken: Internationalism. Learned borrowing from New Latin encephalon, from Ancient Greek ἐγκέφαλος (enképhalos, “within the head”), from ἐν (en, “in”) + κεφαλή (kephalḗ, “head”).
köken: Simplified from an earlier мозг (mozg), with final -г devoiced (as usual for word-final voiced stops) and later interpreted as the diminutive suffix -ък (-ǎk). Ultimately, inherited from Proto-Slavic *mozgъ.
Internationalism. Learned borrowing from New Latin encephalon, from Ancient Greek ἐγκέφαλος (enképhalos, “within the head”), from ἐν (en, “in”) + κεφαλή (kephalḗ, “head”).