Sindarin name for Mount Q. Oiolossë (PE17/26), usually appearing in the fuller name Amon Uilos. It is a combination of ui “ever” and loss “snow”.
Conceptual Development: In The Etymologies from the 1930s, this name first appeared as (rejected) N. Guilos from the root ᴹ√GEY (Ety/GEY), revised to Uiloss from the root ᴹ√EY (Ety/EY) and finally N. Uilos from the root ᴹ√OY (Ety/OY), with essentially the same derivation as its later Sindarin name.
[Iolossë] place-name "Everlasting Snow" = Taniquetil (GEY, EY; changed to Oiolossë)