A word for “starlight” and also the name of tengwa #29 [i] (LotR/1123), clearly derived from the root √SIL.
Conceptual Development: The earliest hint of this word was in the Qenya Lexicon of the 1910s where ᴱQ. silmea seems to be an adjective meaning “✱lunar” (QL/56). ᴱQ. silme also seems to be an adjectival element “gleaming, silver” in ᴱQ. silmerána “gleaming moon, silver moon” from the Oilima Markirya poem and its drafts from around 1930 (MC/220; PE16/75). In The Etymologies of the 1930s ᴹQ. silme was derived from primitive ᴹ✶silimē “light of Silpion, †silver” under the root ᴹ√SIL “shine silver” (Ety/SIL) and thus seems to mean “moonlight”. Indeed, silme had the gloss “moonlight” in notes on The Feanorian Alphabet from the 1930s and 40s (PE22/22, 51), where it was already the name of tengwa #29. It became “starlight” in Appendix E of The Lord of the Rings, however (LotR/1123), and elsewhere “moonlight” was isilmë (MC/223).
silmë noun "starlight", also name of tengwa #29 (Appendix E), though in the pre-classical Tengwar system presupposed in the Etymologies, the name silmë instead applied to tengwa #3 (VT46:13). Silmë nuquerna "_s reversed", name of tengwa #30, similar to normal silmë but turned upside down (Appendix E)_. In the Etymologies, stem SIL, silmë is defined as the "light of Silpion" (Telperion), and also a poetic word for "silver".