The Sindarin name of the mountain Q. Oiolossë (S/37). The first element is amon “hill” and the second element Uilos “Ever-snow” is the cognate of its Quenya name.
Conceptual Development: The earliest form of this name was N. Amon Uilas with an a corresponding to earlier ᴹQ. Ialasse (SM/81), but it was revised to N. Amon Uilos in Silmarillion drafts from the 1930s (LR/210). This form of the name also appeared in The Etymologies (Ety/OY).
Taniquetil (or Taníquetil) is Quenya (pronounced [taˈnikʷetil]) and means "high-snow-peak". The name can be analyzed as ta- (cf. tára) "high", nique "white" and til "point".