Proto-Indo-European Roots
| Root/Stem: | *swesór- |
| Meaning: | a sister |
| Cognates: | |
| Hellenic | Greek heor, eor (a daughter, a girl) |
| Italic | Latin soror (a sister) < *sesor,
French soeur |
| Celtic | Common Celtic *svesór, > Old Irish siur (a sister), gen. sethar, Welsh chwaer, Breton c'hoar, Irish Gaelic deir-fiur (a sister), Scottish Gaelic piuthar, Old Cornish huir, Cornish hoer |
| Indic | Sanskrit svasar- (a sister) |
| Dardic & Nuristani | Khowar ispt-sar, ispu-sar (younger sister) ? |
| Iranian | Avestan xwanghar- (a sister) |
| Anatolian | |
| Tocharian | Tocharian A s.ar, B s.er (a sister) |
| Armenian khoir (a sister), pl. khorkh | |
| Germanic | Common Germanic *swistér, *swistór,
> Gothic swistar, Old English sweostor , Old High German swester, Old Norse systir, Old Saxon & Old Swedish swiri (son of mother's sister); German Schwester, Dutch zuster |
| Baltic | Lithuanian sesuo, gen. seseris, Old Prussian swestro |
| Slavic | Common Slavic *sestra, > Ukrainian & Belorussian & Old Russian & Old Church Slavonic & Bulgarian & Serbo-Croatian & Slovene & Czech & Slovak & Russian sestra, Polish siostra, Upper Sorbian sotra |
| Notes: | Though it is one of the typical r-stem nouns, denoting kinship, its case is quite peculiar. Its suffix *-sor can be found in many other words for feminine animate nouns, like Hittite nasu-sara (a queen), Sanskrit strí 'woman', etc. This suffix was here added to the word *swe- which is obviously the reflexive Indo-European pronoun. |