Where does “birmovka” come from?

birmovka (Slovak) comes from Slovak birmovať, from Middle High German firmen, from Old High German firmōn, from Latin firmāre, from Latin Firmus, from Proto-Italic fermos, from Proto-Indo-European dʰer-mo-s, from Proto-Indo-European dʰer- — to support; to hold.

birmovka (Slovak): The ritual of the Catholic sacrament of...