glass

noun. brilliance, clarity

glâs

noun. brilliance, clarity

celeg

noun. glass

talp

noun. glass

celchin

adjective. of glass

The Gnomish Lexicon of the 1910s had several glass-related adjectives: G. {celcin} > celchin “of glass”, G. {celcwed} > celchwed “glassy”, and G. celegrin (archaic cailegrin) “glassy, like glass”, all based on the nouns G. celc or celeg/caileg “glass” (GL/25).

Neo-Sindarin: For purposes of Neo-Sindarin I would update these to an adjective ᴺS. heledhren “glassy, like glass, of glass” based on the later Sindarin word heledh for “glass”.

libli

noun. small glass; small drop

A word in the Gnomish Lexicon of the 1910s meaning either “a small glass” or “a small drop” (GL/54), based on the early root ᴱ√LIPI as suggested by Christopher Tolkien (QL/86; LT1A/limpë).

celc

noun. glass, a glass

celegrin

adjective. glassy, like glass

crithosceleg

proper name. Disc of Glass

celchwed

adjective. glassy

galwen

noun. brilliance

gaul

noun. light