Celebrant
From Tolkien Gateway
Celebrant was a stream rising in the eastern Misty Mountains from the Mirrormere in the Dimrill Dale. It then ran through Lothlórien where it was met by the Nimrodel river, and emptied into the Anduin. The Fellowship of the Ring followed this river when they travelled from Moria to Lórien.
It was called Silverlode in Westron and Kibil-nâla in Khuzdul, the language of Dwarves.