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From Latin Trānseuphrātaeus + -an. By surface analysis, trans- + Euphratean.
Etymology from Wiktionary, CC BY-SA 4.0.
Transeuphratean
Today it means: Of or relating to the lands west of the Euphrates that were incorporated into the Assyrian, Babylonian and later Achaemenid province of Eber-Nari (from Akkadian meaning 'Beyond the River, i.e. the Euphrates'). Full definition →