An archaic or poetic word for star (WJ/362), somewhat common in compounds but in ordinary speech typically appearing as elen. It was derived directly from the primitive root √EL “behold”, the basis for other star words (PM/340; WJ/360).
Conceptual Development: This word first appeared as poetical ᴹQ. él “star” in The Etymologies of the 1930s, already with the derivation given above, though in this document the root ᴹ√EL meant “star” (Ety/EL), a common gloss for the root in later writings as well.
The most common Quenya word for “star”, mentioned very frequently, derived from an extended form ✶elen of the root √EL “behold” (PE17/67; WJ/360, 362). Its usual plural form is eleni, but it has an archaic plural †eldi sometimes used in verse, the result of the Ancient Quenya sound whereby [[aq|[ln] became [ld]]] after the ancient plural underwent the Quenya syncope, ✶elenī > AQ. elni; its normal modern plural form eleni was actually a reformation from the singular (PE17/57, 151; WJ/362).
Conceptual Development: This word first appeared in The Etymologies of the 1930s, though in the original entry for the root ᴹ√EL Tolkien said it was poetical and gave variants ellen and elena (Ety/EL).