A word for “sky” in an early name list from the 1910s and appearing in a couple early names: G. Thlim Quing Ilon “✱Folk of the Heavenly Arc” and G. Cris o Teld Quing Ilon “Gully of the Rainbow Roof” (PE13/101, 104), the latter revised to G. Cris Ilbranteloth (LT2/202). In the contemporaneous Gnomish Lexicon, however, G. Ilon was the name of Ilúvatar (GL/50).
Gnomish
luist
noun. thirst
luista-
verb. to be thirsty; to parch, dry up
luista nin
I am thirsty
dai
noun. sky
ilon
noun. sky
luibri
noun. thirst
luithon
noun. sky
A word for “sky” in the Gnomish Lexicon of the 1910s, an elaboration of G. lui “blueness” (GL/55).
maig
adjective. thirst
A verb in the Gnomish Lexicon of the 1910s which can be used transitively for “to parch, dry up” and impersonally to mean “I am thirsty”: luista nin (GL/55). It is based on the early root ᴱ√LOYO (QL/56).
Neo-Sindarin: For purposes of Neo-Sindarin, I would simply say ni faug for “I [am] thirsty” and would use ᴺS. [G.] thista- for “to dry up” (GL/73).