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Latin word soror comes from Proto-Indo-European *su-h₁ésh₂-ōr, and later Proto-Indo-European *swésōr (Sister.)
*su-h₁ésh₂-ōr (Proto-Indo-European)
*swésōr (Proto-Indo-European)
Sister.
*swezōr (Proto-Italic)
Sister.
soror (Latin)
Cousin, daughter of a father's brother. Female friend. Sister.