Eldarin adj. derived from Elda: "Eldarin, Elvish" (Silm, ÉLED). Also in the longer form Eldarinwa (pl. Eldarinwë in VT47:14, in the title Eldarinwë leperi ar notessi, "The Eldarin fingers and numerals")
Quenya
elda
of the stars
Eldarin
eldarin, elvish
elda-lambë
proper name. Language of the Eldar
Elda-lambë
the language of the eldar
Elda-lambë noun "the language of the Eldar" (WJ:368)
Eldo
marchers
Eldo noun, archaic variant of Elda, properly one of the "Marchers" from Cuiviénen, but the word went out of use (WJ:363, 374)
vanimelda
the highest word of praise for beauty
vanimelda adj., said to be "the highest word of praise for beauty", with two interpretations that were apparently considered equally valid and simultaneously true: "beautiful and beloved" (vanima + melda, with haplology), i.e. "movingly lovely", but also "elven-fair" (fair as an Elf) (vanima + elda). The word was also used as the second name of Arwen. (PE17:56, Second Edition LotR1:II ch. 16).
Elendil
star-friend
Elendil masc. name"Star-friend", "Lover or student of stars", applied to those devoted to astronomical lore. However, when the Edain used this name they intended it to mean "Elf-friend", confusing elen "star" and elda "elf" (WJ:410). (This idea that the name was misapplied seems to be late; Tolken earlier interpreted the name as an ancient compound Eled + ndil so that the meaning really was "Elf-friend"; see Letters:386. See also NIL/NDIL in the Etymologies, where Elendil is equated with "Ælfwine", Elf-friend.) Allative Elendilenna "to Elendil" (PM:401); Elendil Vorondo genitive of Elendil Voronda "Elendil the Steadfast" _(CO) Pl. Elendili the Númenórean Elf-friends (Silm)_; the variant Elendilli in SD:403 would seem to presuppose a stem-form Elendill- not attested elsewhere. Tar-Elendil a Númenorean king, UT:210.
elena
of the stars
elena adj. "of the stars" (SA:êl, elen); also elenya
lér
man
**lér noun "man" (NI1; hypothetical Q form of PQ dēr; the form actually used in Quenya was nér)
noldo
noun. Noldo
Noldo, Gnome
nér
man
nér (1) (ner-, as in pl. neri) noun "man" (adult male elf, mortal, or of other speaking race) (MR:213, VT49:17, DER, NDER, NI1, VT45:9; see also WJ:393)
nér
noun. man
vëo
man
†vëo noun "man" (WEG; etymologically connected to vëa "manly, vigorous"; the more neutral word for "man" is nér. According to VT46:21, Tolkien indicated that vëo is an archaic or poetic word.) Tolkien at a later point defined the word as "living creature" (PE17:189). Cf. variant wëo, q.v.
elda 1. originally adj. "of the stars", but wholly replaced (WJ:362) by: 2. noun (Elda) = one of the people of the Stars, (high-)elf, an Elf (SA:êl, elen, Letters:281, ELED, ÉLED; notice that Tolkien abandoned a former etymology with "depart"), chiefly in the pl. Eldar (WJ:362, cf. GAT(H), TELES).The primitive form Tolkien variously cited as ¤eledā / elenā(Letters:281, PE17:152) and ¤eldā(WJ:360). Partitive pl. Eldali (VT49:8), gen. pl. Eldaron (WJ:368, PM:395, 402);dative pl.eldain "for elves", for Eldar (FS); possessive sg. Eldava "Elf's" (WJ:407); possessive pl. Eldaiva (WJ:368), Eldaivë governing a plural word (WJ:369). The word Eldar properly refers to the non-Avari Elves only, but since Eldar rarely had any contact with the Avari, it could be used for "elves" in general (in LT1:251, Elda is simply glossed "Elf"). See also Eldo. The plural form Eldar should not require any article when the reference is to the entire people; i Eldar refers to a limited group, "(all) the Elves previously named"; nevertheless, Tolkien in some sources does use the article even where the reference seems to be generic (i Eldar or i-Eldar, VT49:8).