Etymology
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seraglio (n.)

"harem," also the name of a former palace of the sultan in Istanbul, 1580s, from Italian seraglio, alteration of Turkish saray "palace, court," from Persian sara'i "palace, inn," from Iranian base *thraya- "to protect" (source also of Avestan thrayeinti "they protect"), from PIE *tra-, variant form of root *tere- (2) "cross over, pass through, overcome."

The Italian word probably reflects folk etymology influence of serraglio "enclosure, cage," from Medieval Latin serraculum "bung, stopper" (see serried).

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*tere- (2)

*terə- Proto-Indo-European root meaning "cross over, pass through, overcome."

It forms all or part of: avatar; caravanserai; nectar; nectarine; nostril; seraglio; thrill; thorough; through; tranche; trans-; transient; transom; trench; truculent; truncate; trunk.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit tirah, Avestan taro "through, beyond;" Latin trans "beyond;" Old Irish tre, Welsh tra "through;" Old English þurh "through."

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