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).
A Quenya name for Mirrormere (S. Nen Cenedril) appearing in notes from 1968 (NM/353). It is a compound of angal “mirror” and ailin “lake”. In earlier iterations these notes, Tolkien gave the name as {Angal-mille >>} Angal-limpe (NM/350, 353).