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French word sœur comes from Proto-Indo-European *swésōr (Sister.), Proto-Indo-European *swoyd-
*swésōr (Proto-Indo-European)
Sister.
*swoyd- (Proto-Indo-European)
*swezōr (Proto-Italic)
Sister.
sudo (Latin)
I sweat, perspire.
sororis (Latin)
seror (Old French)
Sister.
suer (Old French)
soeur (Middle French)
Sister.
sœur (French)
(Christianity) nun. Sister.