Quenya 

calima

adjective. bright, luminous
Quenya [Let/278; Let/279; Let/385; LotR/0720; LotR/0915; LotR/1116; PE17/056; PE17/057; PE17/090; PE17/091; PE17/101; PE17/146; PE17/153; PE22/137; PE22/155; PE22/156] Group: Eldamo. Published by

calima

bright

calima adj. "bright" (VT42:32); cf. ancalima; in PE17:56, arcalima appears as another superlative "brightest" (see ar- #2).

* tuntaitë

adjective. bright, witty, smart, *perceptive
Quenya Group: Eldamo. Published by

Sindarin 

gelion

place name. Gelion

A great river in eastern Beleriand (S/54). The meaning of the name is unclear. Given the river’s location in Ossiriand, this name might be Nandorin instead.

Conceptual Development: The name N. Gelion first appeared in Silmarillion drafts from the early 1930s as a revision of earlier Flend (SM/135). In The Etymologies, Tolkien said the name was based on the Ilkorin word gelion “bright” (Ety/GYEL). In later notes, Tolkien considered renaming the river to Gelduin >> Gevilon >> Gevelon, the last of these an adaptation of Khuzdul Gabilân “Great River” (WJ/336). He did not apply this change in the Silmarillion revisions from the 1950s-60s, however.

Sindarin [LT2I/Gelion; MRI/Gelion; SI/Gelion; WJ/336; WJI/Gelduin; WJI/Gelion; WJI/Gevelon] Group: Eldamo. Published by

glân

adjective. bright, shining white

The word is deduced from its mutated form, but it is worth mentioning that a stem GALÁN "bright", with glan "daylight" (and later "clear") as derivative, is listed in the Etymologies (not included in the published text, but see VT/45:13). Most of the words meaning "white" in the Indo-Eureopean languages come from the original notion of "brightness", e.g. Greek leukós "white" is cognate with Latin lucere "to shine", lux "light". This association of sense is also found in Gnomish, PE/11:39 (glan "clean, pure", from "bright" originally) and in Early Noldorin (PE/13:144, glann "clean"). The similarity with Welsh glan (where the vowel, incidentally, is also long, though this is concealed by Welsh orthographic convention) is also striking

Sindarin [Curunír 'Lân UT/390] Group: Hiswelókë's Sindarin Dictionary. Published by

* gail

bright

gail (light), lenited ngail; no distinct pl. form (VT45:18). The adj. calen etymologically means "bright", but is used = "green" (q.v.).

Noldorin 

gelion²

masculine name. Merry Singer

A sobriquet of Tinfang appearing in the Lays of Beleriand from the 1920s (LB/174) and Silmarillion drafts from the early 1930s (SM/115). The name reappeared in The Etymologies from mid-1930s with the gloss “Merry Singer”, but the character did not appear in the Silmarillion drafts from the same period.

Noldorin [Ety/GYEL; SM/115] Group: Eldamo. Published by

gelion¹

place name. Gelion¹
Noldorin [Ety/GYEL; Ety/THAR; LR/265; LRI/Gelion; SM/135; SMI/Flend; SMI/Gelion] Group: Eldamo. Published by

gail

adjective. bright, light
Noldorin [Ety/KAL; EtyAC/KAL] Group: Eldamo. Published by

Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Primitive elvish

kalinā

adjective. bright
Primitive elvish [PE22/136] Group: Eldamo. Published by

Qenya 

selka

adjective. bright
Qenya [PME/083; QL/083] Group: Eldamo. Published by

tunke

adjective. bright, witty, smart
Qenya [QL/095] Group: Eldamo. Published by

Doriathrin

gelion

adjective. bright

An adjective meaning “bright” derived from the root ᴹ√GAL, the basis of the river name Gelion (Ety/GYEL). There isn’t enough information to deduce its primitive form, but Helge Fauskanger suggested galjānā* (AL-Ilkorin/gelion), which seems reasonably plausible.

Doriathrin [Ety/GYEL] Group: Eldamo. Published by

Middle Primitive Elvish

galan

root. bright
Middle Primitive Elvish [EtyAC/GAL¹] Group: Eldamo. Published by

galyā

adjective. bright, light
Middle Primitive Elvish [Ety/KAL; EtyAC/KAL] Group: Eldamo. Published by

Gnomish

glarw(ed)

adjective. bright, light
Gnomish [GL/39; PE13/114] Group: Eldamo. Published by

Early Noldorin

gelion

masculine name. Gelion
Early Noldorin [LB/174] Group: Eldamo. Published by

* glarweb

adjective. bright, light
Early Noldorin [PE13/126; PE13/141] Group: Eldamo. Published by