Sindarin 

sîr luin

place name. Sîr Luin

A variant name for the river Lhûn which Tolkien abandoned after he remembered that its other name appeared on the maps of The Lord of the Rings (VT48/23, 28). It is a combination of sîr “river” and luin “blue”.

Elements

WordGloss
sîr“river, stream”
luin“blue”
Sindarin [VT48/23; VT48/28] Group: Eldamo. Published by