a river in SW Asia, flowing from E Turkey through Syria and Iraq, joining the Tigris to form the Shatt-al-Arab near the Persian Gulf. 1700 miles (2735 km) long.
Related formsEu·phra·te·an, adjectivetrans-Eu·phra·tes, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for trans-euphrates
a river in SW Asia, rising in E Turkey and flowing south across Syria and Iraq to join the Tigris, forming the Shatt-al-Arab, which flows to the head of the Persian Gulf: important in ancient times for the extensive irrigation of its valley (in Mesopotamia). Length: 3598 km (2235 miles)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for trans-euphrates
Old English Eufrate, from Greek Euphrates, from Old Persian Ufratu, perhaps from Avestan huperethuua "good to cross over," from hu- "good" + peretu- "ford." But Kent says "probably a popular etymologizing in O.P. of a local non-Iranian name" ["Old Persian," p.176]. In Akkadian, purattu.
Online Etymology Dictionary, © 2010 Douglas Harper