From Middle English twinne, twynne, from Old English ġetwin, ġetwinn and twinn, from Proto-Germanic *twinjaz, *twinaz, from Proto-Indo-European *dwino- ("twin"), from *dwóh₁. Cognate with Scots twyn ("twin"), Dutch tweeling ("twin"), German Zwilling ("twin"), Swedish tvilling ("twin"), Faroese tvinnur ("a double set"), Icelandic tvenna ("duo, pair"), Lithuanian dvynys ("twin"), Russian двойня ("twin").
From Middle English *twin, *twyn, from Old English twin, twinn, from Proto-Germanic *twīhnaz, from Proto-Indo-European *dwóh₁. Cognate with Icelandic tvennur, Gothic 𐍄𐍅𐌴𐌹𐌷𐌽𐌰𐌹.
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