In The Etymologies (Ety/358, corrected by VT/45:15), this word was given as geil , plural gîl. However, later in LotR/E and RGEO/73, Tolkien seems to consider gil as a singular (with no hints in the sources of what the plural would be, besides the collective plural giliath )
Sindarin
gil
noun. star, (bright) spark, silver glint, twinkle of light
gil
noun. gil
gil
noun. star, bright spark
gil-
noun. star
gill
noun. star
giliath
noun. all the host of stars
el
starn. star.
elen
noun. star
elen
starpl1. elin, pl2. elenath _n._star. Its collective plural (pl2.) designates 'the (host of all the) stars, (all) the (visible) stars of the firmament'. Q. elen, pl1. eldi, eleni. o menel aglar elenath ! lit. 'from Firmament glory of the stars !'. >> êl
êl
noun. star
êl
starpl1. elin, pl2. elenath** ** n. star. Q. elen, pl1. eldi, eleni, pl2. elelli. >> elen
êl
noun. star (little used except in verses)
* Ilwen
gil_ (LR:358) and would then have the form Ilwen (Ilwith) when lenited. But in a later source, Tolkien cited the relevant root as _Ñ
* Ilwen
gil_ (LR:358), and the lenited forms would thus be Ilwen, Ilwith. But in a later source, Tolkien cited the relevant root as _Ñ
* Ngilwen
gil_ (MR:388) and the lenited form would then be Ngilwen (Ngilwith). (In the Etymologies, the root was given as GIL, and the lenited form would then be Ilwen / Ilwith.)
* Ngilwen
gil_ (MR:388), and the lenited form would then be Ngilwen (Ngilwith).
* Ngilwen
gil_ (MR:388), and the lenited form would then be Ngilwen (Ngilwith).
* gîl
stargîl (i ngîl = i ñîl, o n**gîl, construct gil) (bright spark, silver glint), no distinct pl. form except with article (in gîl = i ñgîl), coll. pl. giliath** (RGEO, MR:388). Poetic †êl (elen-, pl. elin, coll. pl. elenath) (RGEO, Letters:281, WJ:363).
n. -.