Silmaril(Silmarill-)

as in pl. Silmarilli, noun, name of the shining jewels made by Fëanor; full sg. form Silmarillë SA:sil, SIL, RIL, MIR.Translated "radiance of pure light" in Letters:148. Gen. pl. Silmarillion, as in Quenta Silmarillion "the Story of the Silmarils".