Sindarin 

Celduin

noun. running river

cell (adj. “running, flowing”) + duin (“big and large river”)

Sindarin [Tolkiendil] Group: Tolkiendil Compound Sindarin Names. Published by

celduin

place name. River Running

A river flowing from lake Esgaroth into the river Carnen, translated “River Running” (LotR/1046). It is most likely a combination of some form of the root √KEL “flow” and S. duin “duin”.

Elements

WordGloss
KEL“flow (down or away), run (of water or rivers), go away, flow (down or away), run (of water or rivers), go away, [ᴹ√] run away especially downwards or at end; [ᴱ√] ooze, trickle”
duin“(large) river, (large) river; [N.] water”
Sindarin [LotR/1046; LotR/1072; LotRI/Celduin; LotRI/River Running; PMI/Celduin; UTI/Celduin] Group: Eldamo. Published by