Where does “densitas ruah” come from?

densitas ruah (Indonesian) comes from Mizo ruah, from Middle High German ruo, from Old High German ruowa, from Proto-West Germanic rōu, from Proto-Germanic *rōō, from Proto-Indo-European h₁reh₁- — to row; to separate; loose, sparse, rare.

Ancestry of “densitas ruah”, step by step

densitas ruah traces back through two separate lines of ancestry.

via Mizo ruah

StepLanguageWordMeaning
1Mizoruahrain
2Middle High Germanruo
3Old High Germanruowapeace, quiet, rest
4Proto-West Germanicrōucalm, quiet; rest, repose
5Proto-Germanic*rōōcalm, quiet
6Proto-Indo-Europeanh₁reh₁-to row; to separate; loose, sparse, rare

via Latin densitas

StepLanguageWordMeaning
1Latindensitasthickness; density; abundance
2Latin-tāsty, -dom, -hood, -ness, -ship
3Proto-Indo-European-teh₂tsUsed to form nouns representing state of being
4Proto-Indo-European-teh₂Used to form nouns representing state of being
5Proto-Indo-European-tósCreates verbal adjectives from verb stems
Every word from Proto-Indo-European h₁reh₁-Every word from Proto-Germanic *rōōEvery word from Proto-West Germanic rōu