sister

• n. 姉妹; （気の合う）姉妹; 尼僧; 看護婦.
• adj.姉妹のような; 同類の

中英語の sister から、古英語の sweoster, sister, nun から、原ゲルマン語の *swester, sister から、PIE *swesor, sister から、おそらく PIE *swe, own, 語源は self と同じ、-sor, sister, 語源は PIE *es-ro, blood, 語源は sanguine, sorority と同じ。この綴りは、spinster（紡ぎ女）のように接尾辞-sterによって卑俗化されることもある。

sister

sister: [OE] Sister is one of a widespread family of ‘sister’-words that go back ultimately to Indo- European *swesor. Amongst its other descendants are Latin soror (source of French soeur, Italian sorella, and Romanian sora, not to mention English sorority [16]), Russian, Czech, and Serbo-Croat sestra, Polish siostra, Welsh chwaer, Breton c’hoar, Lithuanian sesuo, and Sanskrit svasar-. To prehistoric Germanic it contributed *swestr, which has evolved into German schwester, Dutch zuster, Swedish syster, Danish s?ster, and English sister. English cousin goes back ultimately to a compound based on *swesor, the Old Latin antecedent of soror.
=> sorority

sister (n.)

mid-13c., from Old English sweostor, swuster "sister," or a Scandinavian cognate (Old Norse systir, Swedish syster, Danish s?ster), in either case from Proto-Germanic *swestr- (cognates: Old Saxon swestar, Old Frisian swester, Middle Dutch suster, Dutch zuster, Old High German swester, German Schwester, Gothic swistar).

These are from PIE *swesor, one of the most persistent and unchanging PIE root words, recognizable in almost every modern Indo-European language (Sanskrit svasar-, Avestan shanhar-, Latin soror, Old Church Slavonic, Russian sestra, Lithuanian sesuo, Old Irish siur, Welsh chwaer, Greek eor). French soeur "a sister" (11c., instead of *sereur) is directly from Latin soror, a rare case of a borrowing from the nominative case.

According to Klein's sources, probably from PIE roots *swe- "one's own" + *ser- "woman." For vowel evolution, see bury. Used of nuns in Old English; of a woman in general from 1906; of a black woman from 1926; and in the sense of "fellow feminist" from 1912. Meaning "female fellow-Christian" is from mid-15c. Sister act "variety act by two or more sisters" is from vaudeville (1908).

1. My sister needed an escort for a company dinner.

私の妹は彼女と一緒に会社の晩餐会に参加する男のパートナーが必要です。

2.He had very little in common with his sister .

彼は姉とほとんど共通言語を持っていない。

3.Ray and sister Renee lived just 25 miles apart from each other.

レイと妹レニーの住まいは25マイルしか離れていない。

4. Sister Francesca entered the chapel，took her seat，and promptly fell asleep.

フランシスカード修道女は小さな教会に入って座り、すぐに眠ってしまった。

5. Sister Morrison might take issue with me on that matter.

モリソン修道女はそのことについて私と異なる意見を持つかもしれません。