The story
- Proto-Indo-European*swé
- Proto-Indo-European*h₁ésh₂r̥
- Proto-Indo-European*su-h₁ésh₂-ōr?
- Proto-Indo-European*swé
- Proto-Indo-European*swésōr
- Proto-Italic*swezōr
- Latinsoror
- Proto-Indo-European*kh₂eyd-
- Proto-Indo-European*kh₂éydeti
- Proto-Italic*kaidō
- Latincaedō
- Latinsorōricīdium
- Englishsororicide
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- English todaysororicidal
From sororicide + -al.
Etymology from Wiktionary, CC BY-SA 4.0.