Where does “søstær” come from?

søstær (Old Danish) comes from Proto-Norse ᛊᚹᛖᛊᛏᚨᚱ, from Proto-Germanic swestēr, from Proto-Indo-European swésōr, from Proto-Indo-European su-h₁ésh₂-ōr, from Proto-Indo-European h₁ésh₂r̥ — blood.

Ancestry of “søstær”, step by step

StepLanguageWordMeaning
1Proto-Norseᛊᚹᛖᛊᛏᚨᚱsister
2Proto-Germanicswestērsister
3Proto-Indo-Europeanswésōrsister
4Proto-Indo-Europeansu-h₁ésh₂-ōr
5Proto-Indo-Europeanh₁ésh₂r̥blood
Every word from Proto-Indo-European h₁ésh₂r̥Every word from Proto-Indo-European su-h₁ésh₂-ōrEvery word from Proto-Indo-European swésōr