Where does “pesetrum” come from?

pesetrum (Indonesian) comes from Indonesian setrum, from Dutch stroom, from Middle Dutch strôom, from Old Dutch strōm, from Proto-West Germanic straum, from Proto-Germanic straumaz, from Proto-Indo-European srowmos, from Proto-Indo-European srew- — to flow; to guard; to bind, to tie together.

Ancestry of “pesetrum”, step by step

StepLanguageWordMeaning
1Indonesiansetrumelectrical current
2DutchstroomA flow, current or flush, as of moving water or...
3Middle DutchstrôomA stream
4Old Dutchstrōm
5Proto-West Germanicstraumstream
6Proto-Germanicstraumazstream, current, river
7Proto-Indo-Europeansrowmosriver
8Proto-Indo-Europeansrew-to flow, stream
9Proto-Indo-Europeanser-to flow; to guard; to bind, to tie together
Every word from Proto-Indo-European ser-