So called from the rapidity of its current. Hiddekel is
“The Dekel,” or Diglath, a Semitic corruption of Tigra, Medo-Persic for arrow. (Gen. ii. 14.)
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“Fluʹmini, a celeritaʹte qua defluit Tigri nomen est; quia Persica lingua, tigrim sagittam appellant.”—Quintus Curtius.