adu (Ilk (AS?) “double”) + rant (“load, vein”)
Sindarin
adurant
place name. Double Stream
Elements
Word Gloss adu “double” rant “course, water-channel; lode, course, water-channel; lode, [N.] vein”
Adurant
noun. double course
Adurant
Adurant
The name means Doublestream (from adu "double" and rant "course") in Sindarin, referring to a parting of the river about the isle of Tol Galen.
Adurant
Doublestream
One of the seven streams from which Ossiriand got its name (S/123). The stream divided around the island Tol Galen, and was thus named “Double Stream” (SI/Adurant), a compound of adu “double” and rant “course” (SA/rant). Given the river’s location in Ossiriand, this name might be Nandorin instead.
Conceptual Development: In The Etymologies from the 1930s, the name Adurant was designated Ilkorin, but otherwise had the same meaning (Ety/AT(AT)). Like many of the river names in Ossiriand, Tolkien did not give a new etymology of the name after he abandoned the Ilkorin language.