Sindarin name of Mirrormere, not appearing in the published version of The Lord of the Rings (PE17/35), a combination of nen “water” and cenedril “looking-glass” (PE17/47).
Conceptual Development: Tolkien first considered and rejected the name Nen Singil (PE17/35).
topon. 'Lake looking-cristal', Mirrormere. Dw. Kheled-zâram. Nen Cenedril << Nen Singil.