umboth

noun. large pool

A Doriathrin noun meaning “large pool”, apparently an elaboration of moth “pool” (Ety/MBOTH). Either the u- is some kind of prefix, perhaps an intensifier, or the initial [m] of the root became syllabic, both as suggested by Helge Fauskanger (AL-Ilkorin/umboth).

Conceptual Development: Tolkien seems to have coined this word to explain Umboth Muilin “Twilight Meres”, a remnant of earlier G. Umboth-muilin “Pools of Twilight”. The meaning of the Ilkorin elements is reversed from the earlier name: in Gnomish the word G. umboth meant “twilight” (GL/75). In later writings, Tolkien replaced this name with S. Aelin-uial “Meres of Twilight”.

Element in

• Ilk. Umboth Muilin “Twilight Meres, Veiled Pool” ✧ Ety/MBOTH

dûm

noun. twilight

A noun for “twilight” developed from primitive ᴹ✶dōmi (Ety/DOMO), where the long [[ilk|[ō] became [ū] before [m]]].

Derivations

• ᴹ✶dōmi “night, twilight, gloom” ✧ Ety/DOMO
  • ᴹ√DOM “faint, dim” ✧ Ety/DOMO

Element in

• Ilk. tindum “(starry) twilight, starlight” ✧ Ety/DOMO

Phonetic Developments

Development	Stages	Sources
ᴹ✶dōmi- > dûm	[dōmi] > [dōme] > [dūme] > [dūm]	✧ Ety/DOMO