Another name for Taniquetil (LotR/377, S/37) variously translated as “Everlasting Whiteness”, “Ever-snow”, “Ever-white” or “Ever-snow-white”. This name is a compound of oi(o) “ever” and lossë “snow, snow-white” (RGEO/61).
Conceptual Development: In Silmarillion drafts from the 1930s, this name first appeared as ᴹQ. Ialasse “Everlasting Whiteness” (SM/81). A similar form ᴹQ. Iolosse appeared in The Etymologies (Ety/EY, GEY) and possibly also in the Silmarillion texts (LR/210), but it was rejected and replaced by its final form ᴹQ. Oiolosse (Ety/OY, LR/209).