The Quenya name of Tinúviel (SA/tin, PE19/73). Since she was a Sindarin elf, this name is largely theoretical, as a development from the same primitive form: ✶Tindōmiselde. This name is a compound of tindómë and a suffixal form -rel of seldë “daughter”. In a couple places, Tolkien used this name to illustrated the development of primitive intervocalic ✶[s] into Quenya [r] (PE19/33, 73).
Conceptual Development: The earliest “Qenya” name for Tinúviel was ᴹQ. Tinúviel in linguistic notes from the early 1930s; it was declined in various noun cases, and was clearly intended to be a purely Qenya name rather than an adaptation of the Noldorin Tinúviel (PE21/35). The name ᴹQ. Tindómerel appeared in The Etymologies from the mid-1930s, where it already had the derivation described above (Ety/SEL-D, TIN). In some notes on Quenya phonology from the 1930s, this name appeared as Tindómirel with a medial i (PE19/33), but in a revision of those notes from the 1950s it was reverted back to Tindómerel (PE19/73). It appeared as (Tindómrl) in some examples of left-handed tengwar writing from the 1960s (VT47/37); Tolkien probably neglected to add the vowel diacritics in this case.
An adjective for “renewed” in rough notes from the 1960s. Where it first appeared, Tolkien had {keura “renewal” >>} keure “renewed” (VT48/7). Although keure is not a typical adjective form, it seems this change was intentional, since the corresponding Telerin form was T. ciure (VT48/7). However, on a later page Tolkien wrote keura again below Q. kēva “fresh, new, renewed” and adjacent to the Sindarin adjective S. cŷr; on this later page the noun form seems to be Q. keule (VT48/8). Thus it seems to be that ceura “✱renewed” was restored. Hat-tip to Luinyelle for this suggestion.