köken: Etymology tree Proto-Indo-European *mey- Proto-Indo-European *-rós Proto-Italic *moiros Latin mūrusbor. Proto-West Germanic *mūrā Old High German mūra Middle High German mūrbor. Old Polish mur Polish mur Proto-Indo-European *h₂euh₁-der.? Proto-Slavic *-ovati Old Polish -ować Polish -ować Polish murować From mur + -ować.