Noldorin term for a Silmaril appearing in Silmarillion drafts and The Etymologies from the 1930s (LR/202; Ety/MIR, RIL, SIL). It is a combination of silef “silver, shining white” and the root ᴹ√RIL “glitter”.
Conceptual Development: In the Gnomish Lexicon from the 1910s, the Gnomish equivalent of Silmaril was Silubrilt (GL/67), a combination of Sil “Moon” and brithla “pearl” (LT1A/Silmarilli).
A Noldorin name for the Silmarils appearing in The Etymologies from the 1930s (Ety/MIR), some kind of elaboration on mîr “jewel”.