Strong's Definition
probably of foreign origin; the Chiddekel (or Tigris) river
KJV Usage: Hiddekel
STEPBible — Tyndale Abridged Hebrew Lexicon
חִדֶּ֫קֶל (chid.de.qel) — Tigris.
§ Hiddekel = "rapid" one of the rivers of Eden which coursed east toward Assyria; better known as the Tigris (the LXX equivalent)
UBS Dictionary of Biblical Hebrew
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
חִדֶּ֫קֶל n.pr.fl. Tigris, the famous Assyr. river base