Where does “посестра” come from?

посестра (Ukrainian) comes from Ukrainian сестра, from Proto-Slavic sestra, from Proto-Slavic sesra, from Proto-Balto-Slavic swésō, from Proto-Indo-European swésōr, from Proto-Indo-European su-h₁ésh₂-ōr, from Proto-Indo-European h₁ésh₂r̥ — blood.

посестра (Ukrainian): blood sister An unrelated female considered to share a strong relationship

Definitions

  1. blood sister An unrelated female considered to share a strong relationship

Ancestry of “посестра”, step by step

StepLanguageWordMeaning
1Ukrainianсестраsister; nurse
2Proto-Slavicsestrasister
3Proto-Slavicsesra—
4Proto-Balto-Slavicswésōsister
5Proto-Indo-Europeanswésōrsister
6Proto-Indo-Europeansu-h₁ésh₂-ōr—
7Proto-Indo-Europeanh₁ésh₂r̥blood
Every word from Proto-Indo-European h₁ésh₂r̥ →Every word from Proto-Indo-European su-h₁ésh₂-ōr →Every word from Proto-Indo-European swésōr →